Howard Bornstein is a student in the MBA/MPP combined degree program at the Stanford Graduate School of Business and Public Policy Program. Howard serves on the Executive Committee of the Public Management Program. Prior to business school, Howard worked at the Bill & Melinda Gates Foundation where he developed PRI (Program Related Investment - a type of strategic, mission-oriented low interest loans) investment theses for charter schools and low income affordable housing developments, contributed to new strategy development for the U.S. Program's U.S. Special Initiatives team, and assisted in a variety of other operational, financial, and strategic roles. Prior to the Gates Foundation, he worked at McKinsey & Company's Toronto, Canada office. Former charitable work includes being Chairperson of Youth Tobacco Coalition, a former Toronto- based anti-tobacco organization, and assisting in volunteer consulting for United Nation's High Commissioner for Refugees in Geneva, Switzerland. Howard holds a Honours Bachelor of Arts in Business Administration from the Richard Ivey School of Business. He was recognized as a Siebel Scholar for the class of 2009.

Erik Bengtsson is a Manager of Business Development for DaVita Rx, a mission-driven pharmacy operating within DaVita Inc, a Fortune 500 firm serving kidney failure patients. His role there is to drive growth and develop new services that enhance clinical outcomes of kidney failure patients. Prior to DaVita, Erik was a co-founder of DrinkWell, a social venture developing low-cost technologies to fight malnutrition in the developing world by enriching water with iron at public wells. Erik began his career in management consulting at Bain & Company and subsequently at The Bridgespan Group. He completed a joint degree program (MBA / MA in Education) at Stanford University. He attended the University of Texas at Austin where he earned a BBA in Finance and a BA in Humanities Honors.

Christopher Herndon is the Co-Founder and Chief Operating Officer of Realty Nation, an online real estate marketing startup. Prior to Realty Nation, Chris spent several years as an investor, most recently with GTCR Golder Rauner, a Chicago-based private equity firm. Before that, Chris worked at Goldman Sachs, where he helped to manage the firm's commercial real estate investment funds. In 2003, Chris co-founded The 40 Acres Group, an Austin, TX-based real estate investment firm with a large portfolio of student rental properties. Chris has an MBA from Stanford University and a BBA from the University of Texas at Austin.

Erinn Andrews has a Master of Arts in Education from Stanford University’s School of Education in the Policy, Organization, & Leadership Studies program. She was on the leadership team for the Graduate School of Business Education Club and a Social Chair Representative for the School of Education Guild. Prior to graduate school, Erinn worked in the Office of Undergraduate Admission at Stanford University as the Assistant Director where she managed 73 international territories, reading, evaluating, and supporting recommendations on more than 2,500 freshman applications. Erinn completed her undergraduate studies at Stanford University, earning a Bachelor of Arts in History with honors.

Deyan Vitanov has an MBA from the Stanford Graduate School of Business, where he was an active member of the Entrepreneurship Club. He also holds a Bachelor of Arts in Integrated Social Sciences from Jacobs University Bremen in Bremen, Germany. Previously, Deyan co-founded an internet startup, creating an online community for beginner computer programmers. Furthermore, he has established and led two local Rotaract chapters, part of the Rotary International organization. Through these non-profit ventures, Deyan has worked on local and regional community issues, ranging from helping underprivileged children and orphans to improving K-12 educational programs.

Jacob Harold joined the Hewlett Foundation from The Bridgespan Group--a nonprofit spin-off of Bain and Company--where he advised a variety of nonprofit and foundation clients on programmatic and organizational strategy. Harold has worked as a climate change consultant in New Delhi, India for the David and Lucile Packard Foundation and as a climate change campaigner for Rainforest Action Network and Greenpeace USA. Before that, he was the organizing director for Citizen Works, a Washington, DC-based nonprofit focused on corporate governance issues, and spent a year as a grassroots organizer with Green Corps, where he led campaigns on climate change, forest protection and tobacco control in cities across the country. Harold received a BA from Duke University, where he designed his own major in ethics and intellectual history, and earned an MBA from Stanford's Graduate School of Business. He trained in business strategy with Bain and Company and studied complex systems science in Beijing at the Chinese Academy of Sciences. Harold was born and raised in Winston-Salem, North Carolina, where his parents ran small community-based nonprofit organizations.

William F. Meehan III (Founding Advisory Board Member)
"NKN is the best idea I've seen for doing nonprofit evaluation on a scalable basis. The lovely thing is that it's not only scalable but it can also provide quite robust evaluations."

William F. Meehan III is a senior director of McKinsey and Company Inc. During his 29 years with the firm, Meehan has had extensive experience working with chief executives and senior leaders in technology, private equity, retailing, financial services, and media. His focus includes top management strategy, organization, and leadership, including assisting more than a dozen new CEOs in shaping their agenda.

In addition to his service to clients, Meehan has held many leadership roles with the firm. As a member of the Shareholders Council, McKinsey's board, he is chair of the Client Committee, which is responsible for all client-oriented polices of the firm. In addition, he chairs the Firm Investments Committee, which oversees more than $4 billion of investments through the McKinsey Investment Office. He was formerly vice chair of the Directors Review Committee, co-chair of the Private Equity and Venture Capital Practice, chair of the West Coast practice, and managing director of the San Francisco office.

Meehan is also a regular writer and speaker on the nonprofit and philanthropic sectors with a focus on strategy, governance, and performance measurement. He is lecturer in strategic management at the Graduate School of Business at Stanford University, where he teaches “Strategic Management of Nonprofits,” as well as a faculty affiliate of the Center for Social Innovation and a member of the Stanford Social Innovation Review's board of advisors.

Meehan is a member and former chair of the board of Philanthropic Research Inc., which operates Guidestar.org, the preeminent information source on the nonprofit sector; a member and former chair of the board of directors for the United Way of the Bay Area; a member of the board of the San Francisco Symphony; a member of the California Business Roundtable; and former member of the California Chamber of Commerce, the Committee on JOBS, and the boards of the Oregon Shakespeare Festival and Fordham Prep.

Perla Ni was the founder and former publisher of the Stanford Social Innovation Review, the leading journal on nonprofit management and philanthropy. While at the Review, she also launched the successful www.ssireview.org Web site and blog. Prior to her work at SSIR, Ni co-founded and was editor in chief of Grassroots.com, a nonprofit advocacy Web site named by Forbes as "Best of the Web." A frequent speaker on nonprofits and philanthropy, Ni continues to blog at www.ssireview.org. She has a B.A. from the University of California, Berkeley and a J.D. from Harvard Law School. She's on the advisory board of the Nonprofit Finance Fund and on the board of Goodwill Industries.

Robert G. Ottenhoff
"NKN has found a way to tap into the knowledge of nonprofit experts, something that the nonprofit sector has been trying to figure out for the last 10 years."

Robert G. Ottenhoff was elected president and CEO and a member of the board of directors of GuideStar in September 2002. Mr. Ottenhoff joined GuideStar in the spring of 2002 as president and COO. Established in 1994, GuideStar’s mission is to revolutionize philanthropy and nonprofit practice by providing information that advances transparency, enables users to make better decisions, and encourages charitable giving. Through its Web site, www.guidestar.org, GuideStar assembles and delivers comprehensive financial and programmatic reports on 1.7 million nonprofit organizations and foundations. In 2007, it experienced nearly 11 million user sessions from nonprofit leaders, individual donors, institutional donors, and sector service providers. Mr. Ottenhoff spent several years as president of a high-tech company and operating an international consulting practice. He worked for more than 25 years in executive positions in the public broadcasting field, including serving as the executive vice president and COO of the Public Broadcasting Service (PBS), the executive director of the New Jersey Public Broadcasting Authority, and founder and general manager of WBGO-FM, the New York-area jazz and news station. Mr. Ottenhoff currently serves on the board of directors for Vision TV, Grameen Foundation USA, AAFRC Trust for Philanthropy, and ePhilanthropy Foundation. He is a graduate of Calvin College and Rutgers University.

Dawn Kwan has her Bachelor of Arts from Stanford University in International Relations with a minor in Economics. She aspires to create an online marketplace where giving is encouraged and donors can easily give to high-impact nonprofit organizations. She co-directs research at Philanthropedia, encouraging experts in social causes to share their expertise to identify high-impact nonprofits. Previously, she has interned with Ashoka Foundation in their Middle East office in Egypt, led a clean water dissemination and education program in Uganda, taught HIV/AIDS education to street children, secondary students and HIV/AIDS orphans in Kenya and coordinated and taught English to rural students in China. She enjoys watching documentary films, and watches 30 documentaries at the United Nations Association Film Festival every year.

Formerly, the Economist for Philanthropedia, Dawn is now the Manager of Philanthropedia Research at GuideStar. In her new capacity, she will lead Philanthropedia’s research efforts. She will develop the strategy for continued growth into new causes, rerun old causes, and potentially expand internationally. She will also be responsible for recruiting and managing interns helping with this effort.

Gabrielle Adams is a PhD Candidate at the Stanford Graduate School of Business, studying Organizational Behavior (Management). She specializes in survey design and construction and statistical analyses, and uses them to study human behavior and performance in organizations. Her specific research interests lie in social justice. She holds a BA from Colby College where she majored in Psychology and Philosophy and minored in Human Development.

Nadia Arid is a senior at Stanford University, graduating in June of 2012 with a B.A. in International Studies. Her academic interests are primarily in the area of immigration and the study of refugees and asylum seekers, especially those coming from the Middle East and Africa. An advocate of youth empowerment and education, Nadia is currently the head coach of the Lincoln-Douglas debate team at Palo Alto High School. She has also acted as a mentor and curriculum developer for the East Palo Alto Youth Court since 2009 and helped start a speech and debate program at East Palo Alto’s Eastside College Prep. She has a strong interest in the work of nonprofits and hopes to pursue a degree in law, focusing on immigration, human rights, or international law.

“As a Research Associate for Philanthropedia, I gained a holistic understanding of the organization’s work by being involved in the evaluation of three causes from start to finish. Unlike some organizations that give their interns menial tasks to complete, the Philanthropedia executive team gave me a high degree of freedom and entrusted me with duties that allowed me to develop a wide variety of professional skills. I improved my oral communication skills by calling experts to increase survey response rates, worked on my analytical skills by cleaning up and summarizing experts’ comments, and developed my writing and research skills by creating online profiles for the nonprofits that made the rankings. I was able to feel like an integral part of the team, and I got a sense of the great detail that is put into Philanthropedia’s methodology and the manner in which they present their results. By reading the experts’ testimonies, I also had a chance to learn about what makes a nonprofit effective, which will be valuable knowledge for me if I enter the nonprofit sector in the future. This internship gave me the opportunity to use my background in media relations and data assessment to assist an organization that I believe is advancing the nonprofit sector as a whole.”

Anton Babadjanov is pursuing a Bachelors degree in Business and Computer Science from the University of British Columbia in Vancouver, Canada. He has been involved with non-profits since high-school where he helped students with the university application process. Later he volunteered at the Hollyburn and Vancouver Rotaract clubs in a wide variety of functions including event promotion and setup, club promotion, recruiting and others. Anton received the Rotary Youth Leadership Award in 2006. Passionate about technology, he spent 7 months interning as a program manager at Microsoft’s Seattle and Silicon Valley offices. At Philanthropedia Anton is working on engineering and product design.

Adam C. Bad Wound has previous professional work experience at the Haas Center for Public Service and Stanford Center on Philanthropy and Civil Society. In addition, he has held a variety of research and teaching assistantships at the Stanford Graduate School of Business, Department of Public Policy, and School of Education. He serves on numerous nonprofit boards in the San Francisco Bay Area and served on the advisory board of the Third Millennium Philanthropy and Leadership Initiative at the Center on Philanthropy at Indiana University. Adam holds a B.A. with double majors in multicultural studies and religion from St. Olaf College; M.A. in higher education from Columbia University; M.A. in education policy and M.A. in sociology from Stanford University.

Jeremy Bornstein is a Candidate for a Juris Doctor degree at the University of Western Ontario in Canada. Before law school he worked as a Business Development Consultant at Oracle and as a Business Analyst in Corporate Strategy Consulting at Deloitte. In addition, Jeremy co-founded a professional services firm that helped small and medium businesses bid on and win contracts in the private and public sector. He also holds a Bachelor of Arts Degree in Honors Business Administration from the Richard Ivey School of Business in Ontario, Canada.

Jared Brewer is a senior at Stanford University, studying Ocean Science and Policy through the Earth Systems program. A native of Boulder, Colorado, he grew up skiing and backpacking, and loves complicated music and the great outdoors. Jared was excited to work with Philanthropedia because of its potential to change the paradigm of philanthropy.

Lisa Calfas is a graduate of Stanford University, having studied psychology and physics. She spent the summer 2009 working with a stealth internet start-up, served as a tour guide at Stanford, and poured over countless data sets as a research assistant on campus. She’s been active in local non-profits, from leading a summer program for youth in Oakland to working closely with an East Palo Alto-based non-profit that serves local youth and their families. She’s interested in applying tools from the for-profit sector to increase the impact of non-profit organizations, helping them successfully address complex social issues.

Craig Dabney is pursuing a Master’s of Finance at Claremont McKenna College in Claremont, California. He graduated from Stanford University with a Bachelor of Arts in Human Biology with a concentration in Health Law, Business & Economics. His interest in Philanthropedia stemmed from his own prior research project evaluating the financial sustainability of non-profit organizations in Cape Town, South Africa. Craig hopes to help organizations become more effective in both the for- and non-profit sector.

Brynn Evans is a user experience designer at Google today. She began her career in Psychology, Cognitive Science, and Sociology where she spent 3 years understanding "social search" — or how people's social activities benefit search tasks.

Brynn has also been a business consultant — both independently and with design agencies. She's helped 25+ clients (from giants like Microsoft to startups like Flock) identify and address usability issues with their products, and she's facilitated brainstorming sessions for groups of up to 60 people to think through product features as well as business strategy and leadership goals.

Nicole Gaetjens is part of Stanford's Class of 2012, majoring in Atmosphere/Energy Engineering. Previously she worked at an environmental advocacy organization and volunteered in Bolivia and the Philippines. Though her main passion is waste management, Nicole is interested in a wide range of issues including educational disparities and childhood obesity.

"Working with Philanthropedia opened my eyes to just how large and diverse the nonprofit world is."

Kumi Hodge is currently an undergraduate student in the Department of Psychology at Stanford University. Prior to pursuing a degree at Stanford, Kumi worked on issues of social justice in Oakland CA, organizing local non-violence campaigns, and spent most of his time mentoring inner-city students transitioning into charter schools in the Bay Area. He primarily works on projects related to educational technology and curriculum design for students in low-income families. He has extensive research experience, ranging from brain imaging to designing unique studies that investigate the effectiveness of learning devices. Kumi is interested in educational technology design, topics of psychology, civil rights, and product design. Kumi plans on pursuing a Master's degree in Psychology in 2012.

John Hsu. A graduate from Harvard University, John started his professional career as a management consultant with McKinsey, where he focused on the public, non-profit, and education sectors. In his final project, John worked for the government of Indonesia to help create a new agency responsible for coordinating the reconstruction efforts post-tsunami and managing $5 billion in aid funds. In 2005, John joined staff at Teach For America as the Director of Strategy for the Teacher Support and Development team, where he designed and created an internal performance management system to track the effectiveness of corps members, and helped institutionalize the guidelines for TFA’s significant gains metric. He then transitioned to the New York Program team, where he led a team of 40 staff to support 1000 corps members. Over his tenure, there was a 21% increase in the number of corps members achieving one or more years of growth with their students. John then earned his MBA and MA in Education at Stanford University, where he focused on public management. During his time at Stanford, John worked at Philanthropedia to help develop its initial marketing strategy. Since graduating, John has returned to TFA as the Vice President of Innovation and Strategy. His team’s charge is to identify and manage the exploration of game-changing innovations that have the opportunity to dramatically increase TFA’s impact in the medium- to long-term.

Rebecca Hsu holds a BA in history from Stanford University. She is very interested in international development, especially in the area of water and sanitation. Rebecca was excited to be exposed to the huge, diverse nonprofit world through her internship at Philanthropedia. She now works at the Lucile Packard Foundation for Children's Health, and hopes to have a career in the nonprofit field.

Ioana Ioanovici is a rising senior at Stanford University, majoring in Management Science and Engineering. She is an international student, originally from Romania. In her spare time, she loves to go up to San Francisco and discover its fabulous neighborhoods. Although she plans to build a career in corporate strategy, Ioana is interested in international affairs and development. Knowing how hard it is for Romanian students to apply to top schools in the United States, she plans to start an after-school program that helps underprivileged Romanian students with the college application process.

"Researching about organizations that help at-risk youth and children allowed me to understand how serious this problem is in the United States and at a global level. I am very excited to know what the result of my expert search will be, and I hope that it will make a difference."

Leah Karlins is a Phi Beta Kappa graduate of Stanford University, where she majored in international relations. She previously interned at the U.S. Department of Education, the Monitor Group, and a microfinance NGO in Peru. While at Stanford, Leah conducted research on poverty and inequality in the United States, served on the board of directors of Stanford in Government, and mentored disadvantaged young women with Girls For A Change. Next year, she will begin work as an Associate Consultant at the Bridgespan Group.

"During the internship, I was continually amazed to learn about how much our high-impact nonprofits have accomplished, often with extremely tight resources.  It was inspiring to think I was helping to direct more philanthropic funds toward those organizations."

Jacob Kovacs-Goodman is a sophomore at Stanford University whose interests include political philosophy, Latin, and ancient history. He is the Community Development Director of Stanford in Government, a Levison Leadership Development Fellow, and a participant in various other campus organizations involving service. His interest in Philanthropedia stemmed from his own prior work in public service, an acknowledgment of the many cultural and socioeconomic barriers one faces during service work, and an interest in what constitutes the best form of charitable aid.

Rebecca Krauthamer is a rising Junior at Stanford University pursuing a Bachelor’s degree in Symbolic Systems. Her friends describe her as motivated, optimistic and passionate. During the year she channels these qualities into her schoolwork and, between academic quarters, into her travels and work with international NGO’s. She has traveled independently to Ecuador, Mexico, Japan, Nepal, India, and is currently in Israel, working with organizations promoting human rights. Her experience has led her to the conclusion that the problems the world now faces all stem from prejudice in its various forms. After completing her studies, Rebecca plans to pursue a career in social entrepreneurship promoting international development and civil liberties.

“The best part of working for Philanthropedia was realizing how many people there are out there trying to change the world for the better! I found the names of 800 of these people, but I could see from the work that this was only a tiny percentage."

Sin Lee is an avid technophile and is fascinated by the prospect of using technology to increase the impact of social causes. Although she is originally from Malaysia, she considers herself a globe-trotting citizen of the world.

Julia Li is an upcoming senior at the University of Pennsylvania in 2011, double majoring in Biology and English. Her interests are diverse, including law, business, and dentistry. She has worked in the Alumnae Relations office at the University of Pennsylvania Law School, a vibrant start-up in San Francisco called Identified, and over three dental offices spanning Oregon, California, and Pennsylvania. She decided to work with Philanthropedia to gain insight in non-profit management and to pursue research in a particular field (cancer). The experience has been both educational and fulfilling in that she learned more effective research techniques, was exposed to numerous cancer experts, and met some wonderful and talented people within the organization. 

"During my research, I realized how many small organizations were out there vying for the same cause. Philanthropedia unifies the cause to provide greater efficiency in solving the problem rather than managing each entity separately."

Lee Miller is a Graduate of the University of British Columbia with a BA in History. He has assisted with research at the Institute for the Future, helped with grant making for the Compton Foundation, and has served as a field coordinator for two political campaigns. He is interested in the relationships between government, nonprofits, and the private sector, and how sound and innovative policy can leverage these relationships to improve our society.

“Doing research on healthy food access in Minnesota gave me a valuable perspective on not only a specific area of the nonprofit landscape, but the whole sector. The experience demonstrated the interconnections between government, business and a huge variety of organizations, from the global to the hyper-local.”

Faris Mohiuddin spent Spring/Summer 2010 working on business development, research and product strategy at Philanthropedia. He graduated Phi Beta Kappa from Stanford in 2007 where he studied Political Science and Economics. Prior to Philanthropedia, Faris spent time working at IBM Research, the US House of Representatives, Bain & Company and the William & Flora Hewlett Foundation. He is currently in his first year at the Stanford Law School.

Jamie Nichol is a candidate for her Bachelor of the Arts degree at the University of Pennsylvania. She is studying cultural anthropology and is an active member of the student body, volunteering as a classroom assistant, running environmental workshops with local children, and taking on other leadership roles. Previously she worked as a research assistant for a published author, collecting data and information about the role of women in the global economy. Jamie is interested in the nonprofit world, specifically in the areas of international and local nutrition. She is still exploring various interests and is excited to pursue her next step.

Heather Otto. Hailing from beautiful New England, graduate school brought Heather to the Bay Area five years ago via some great adventures in Baltimore, France and Charlottesville. When she isn’t working on her dissertation here or in Paris, she spends time cooking, eating, feeding her NPR habit, and enjoying the Peninsula on her beloved antique bicycle.

"This was a great mini-internship. As the social cause expansion assistant, I enjoyed every phase of defining the causes and helping to determine the most appropriate social causes for Philanthropedia to pursue. While the potential expert pools were largely responsible for delineating the boundaries of the causes, certain topics offered the challenge of combining Philanthropedia’s goals with an understanding of how major foundations and individual non-profits defined their missions. I found this work to be interesting and fulfilling every step of the way, from the initial brainstorm sessions to the final presentation.

This internship also offered insight into some of the issues facing newer non-profit organizations. (How should we define our position in relation to other organizations in the same space – Philanthropedia vs. Guidestar vs. Network for Good? How do we determine what criteria to prioritize in selecting and defining causes? What kind of balance can/should we strike between comprehensiveness and specificity?) Such questions reflect the unique position of an organization that is not only attempting to fill a market niche and assert its presence there, but one that is seeking to situate itself meaningfully amidst a network of organizations that are committed to effecting real change. It was great to be a part of that.

Finally, and perhaps most importantly, I appreciated the opportunity to research a wide variety of non-profit organizations that were doing amazing work. Immersing myself in a project that allowed me to see what people commit their workdays – and their lives – to was so inspiring!"

Felipe Pimentel

Tristana Pirkl is a graduate of Stanford University, having majored in Human Biology, and originally from Alexandria, VA. She focused her studies on Global Women and Children’s Health and Human Rights and hopes to one day be a part of an effective international non-profit. She was interested in Philanthropedia in order to gain more insight on effective non-profits.

Sara Quinn Born & raised in Sydney, Australia, Sara began her professional career working in strategic development & fundraising for one of the largest public hospitals in Australia. Since then, Sara’s passion for public health has grown, leading her to embark on a career in the health sector & to the study of a Masters of International Health Degree. Sara’s selection in 2009 as an Australian Youth Ambassador for Development launched her international career & saw her spend 2 1/2 years working in the idyllic Fiji Islands in the South Pacific. During her time in Fiji Sara worked for a range of health organizations in the region providing expertise in strategic planning, communications & fundraising. An avid traveler who has explored many corners of the world, Sara counts Tonga, India and Bosnia as her most memorable travel experiences. Sara currently lives in New York where she works for Doctors without Borders and with Philanthropedia as much as possible!

Kate Samardick is a graduate of Stanford University, with a B.A. in International Relations. She is interested in international economic development and empowerment of local communities, with a focus in Latin America. Kate is excited about the work Philanthropedia is doing to promote accountability and informed giving in the nonprofit sector and is very happy to have been part of the team.

Lisa Shieh is currently studying at the University of Southern California (Fight on Trojans!) and double majoring in Fine Arts (graphic design and painting) and Occupational Therapy. With this combination she hopes to utilize her creativity and skills to change people's lives. Lisa first learned of Philanthropedia through an internship network and is so thankful for the opportunity to work with an amazing team and give Philanthropedia's website a facelift! Although attending school in Southern California, she calls the Bay Area home and prefers its weather, pace of life, and nicer drivers. Aside from spending time with the Adobe Creative Suite, Lisa loves reading, music, bargain-hunting, yoga, and consuming desserts.

Stephanie Tan graduated from the University of California, Davis in Asian American Studies with minors in Politcal Science and Education. She has previously worked to promote educational equity, and continues to advocate for underrepresented communities. Stephanie has held numerous leadership positions, and also earned the Outstanding Senior Award in 2010 for UC Davis' Asian American Studies department. In addition to her current work in the legal field and with a radio station in the bay area, she also currently works with Cambodian community groups in San Jose.

"Working with Philanthropedia I was able to see how non-profits are able to serve the community from a broader perspective as well as see different aspects which help make non-profits successful."

Cecilia Yang

JingJing Zhao

2005.9 - 2009.6 B.S. School of Civil Engineering, Dept. of Hydraulic Engineering Tsinghua University, Beijing China;

2009.9 - 2011 M.S. School of Engineering, Stanford University, CA