Full-time staff

Holden Karnofsky | Co-Founder and Co-Executive Director. Holden graduated from Harvard University in 2003 with a degree in Social Studies, and spent the next several years in the hedge fund industry. He co-founded GiveWell in mid-2007.

Elie Hassenfeld | Co-Founder and Co-Executive Director. Elie graduated from Columbia University in 2004 with a degree in Religion, and spent the next several years in the hedge fund industry. He co-founded GiveWell in mid-2007.

Natalie Crispin | Senior Research Analyst. Natalie graduated from Swarthmore College in 2009 with a degree in Economics. She joined GiveWell in July 2009.

Alexander Berger | Program Officer, US Policy. Alexander graduated from Stanford University in 2011 with a BA in Philosophy and an MA in Policy, Organization, and Leadership Studies from the School of Education. He joined GiveWell in July 2011.

Eliza Scheffler | Senior Operations Associate. Eliza graduated from Yale University in 2012 with a BA in American Studies. She joined GiveWell in July 2012.

Timothy Telleen-Lawton | Senior Research Analyst. Timothy graduated from Stanford University in 2006 with a BS and MS in Earth Systems. He worked with Frontier Group and Environment America until he started with Gen110 in 2011. He joined GiveWell in April 2013.

Sean Conley | Research Analyst. Sean graduated from Oxford University in 2012 with a BA in Philosophy, Politics, and Economics. He joined GiveWell in June 2013.

Josh Rosenberg | Senior Research Analyst. Josh graduated from Pomona College in 2013 with a BA in Philosophy and Economics. He joined GiveWell in July 2013.

Ben Rachbach | Research Analyst. Ben graduated from Swarthmore College in 2011 with a BA in Chinese and Education Studies. He then spent a year in China as a Fulbright scholar and tutored for a year with the Match Corps in Boston. He joined GiveWell in August 2013.

Howie Lempel | Program Officer, Global Catastrophic Risks. Howie graduated from Wesleyan University with a BA in Social Studies and Mathematical Economics. He has worked at the Brookings Institution and the Manhattan District Attorney's white collar crime bureau. He is on leave from Yale Law School, where he served as a law clerk at the ACLU National Prison Project and the Orleans Public Defenders. He joined GiveWell in August 2013.

Jake Marcus | Research Analyst. Jake graduated from Yale University in 2008 with a BA in mathematics and from the University of Washington in 2011 with a Master of Public Health. He has worked at the Institute for Health Metrics and Evaluation on the Global Burden of Disease study and at Practice Fusion, an electronic health record company, on its data science team. He joined GiveWell in September 2013.

Rebecca Raible | Research Analyst. Rebecca graduated from Pomona College in 2014 with a BA in Philosophy. She joined GiveWell in August 2014.

Milan Griffes | Research Analyst. Milan graduated from Michigan State University in 2014 with a BA in History. He joined GiveWell in August 2014.

Tyler Heishman | Research Analyst. Tyler graduated from Bentley University in 2008 with a degree in Economics-Finance and spent the next several years in the hedge fund industry. He joined GiveWell in September 2014.

Devin Jacob | Operations Associate. Devin graduated from UC Berkeley in 2005 with a BA in History. He received an MA in History from New York University in 2012. In addition to teaching history to college students, he has worked as a bibliographer, used book seller, geology lab assistant, and commercial salmon fisherman. He joined GiveWell in September 2014.

Ben Hoffman | Research Analyst. Ben graduated from St. John's College in 2008 with a BA in Great Books. He then joined Fannie Mae, where he worked in credit risk and collateral analytics. He also received an MS in Mathematics and Statistics from Georgetown University in 2013. He joined GiveWell in October 2014.

Nick Beckstead | Research Analyst. Nick graduated from the University of Minnesota in 2007 with a degree in Philosophy and Mathematics. He earned a PhD in Philosophy from Rutgers University in 2013, and then worked as a research fellow at the Future of Humanity Institute at Oxford University. Nick joined GiveWell in December 2014.

David Roodman | Senior Advisor. David graduated from Harvard College in 1990 after majoring in theoretical math. He spent eight years at the Worldwatch Institute, rising to Senior Researcher, and eleven at the Center for Global Development, where he became a Senior Fellow. David spent academic year 1998-99 in Vietnam on a Fulbright. In 2013, he served the Gates Foundation as a Senior Economic Advisor. David has written two books, The Natural Wealth of Nations: Harnessing the Market for the Environment and Due Diligence: An Impertinent Inquiry into Microfinance. David joined GiveWell in February 2015.

Helen Toner | Research Analyst. Helen graduated from the University of Melbourne in 2014 with a BSc in Chemical Engineering and a DipLang in Arabic. While studying, she worked at Vesparum Capital, a corporate finance startup. She joined GiveWell in March 2015.

Sophie Monahan | Research Analyst. Sophie graduated from MIT in 2011 with a degree in Philosophy and Physics. She spent one year at Harvard Management Company and two years in the Philosophy PhD program at the University of Michigan before joining GiveWell in May 2015.

Laura Muñoz | Operations Associate. Laura graduated from Pomona College in 2014 with a BA in Environmental Analysis: Society, Development and Economics. She joined GiveWell in May 2015.

Catherine Hollander | Outreach Associate. Catherine graduated from Yale University in 2009 with a BA in history. She then worked as a journalist covering economics and health care for National Journal, and as editorial director for Beacon, an independent funding platform for journalism. She joined GiveWell in May 2015.

Luke Muehlhauser | Research Analyst. Luke studied psychology at the University of Minnesota but left in favor of self-study. He was Executive Director of the Machine Intelligence Research Institute from November 2011 through May 2015. Luke joined GiveWell in June 2015.

Board of Directors

Tom Rutledge (Chair) is in the Structured Credit Group at Magnetar Capital, an Evanston, Illinois-based alternative investment manager. During his career, he has also worked in capital markets businesses at JPMorgan, Deutsche Bank, and Merrill Lynch.

Holden Karnofsky (Secretary) see bio above.

Elie Hassenfeld see bio above.

Greg Jensen is co-Chief Investment Officer at a major hedge fund, the former supervisor of both Holden and Elie, and one of GiveWell's major financial supporters.

Tim Ogden (Vice-Chair) is the former Chief Knowledge Officer of Geneva Global, a philanthropic consulting firm devoted to results-oriented grantmaking in the poorest regions of the world. He currently is managing director of the Financial Access Initiative at NYU and an Executive Partner at Sona Partners, a thought leadership communications firm.

Cari Tuna (Treasurer) is the President of Good Ventures, a San Francisco-based charitable foundation. (See our policy on working arrangement between GiveWell and Good Ventures.)

Phil Steinmeyer spent much of his career in the software industry (primarily games), including founding PopTop Software. He is now an investor.

Brigid Slipka is a fundraiser and a writer based in Washington, DC. She has over ten years experience in nonprofit management and philanthropy.

Rob Reich is an Associate Professor of Political Science at Stanford University. He is Co-Director of Stanford's Center on Philanthropy and Civil Society and is the Director of its Program on Ethics in Society.

Jake Gibson is a mentor and angel investor for early stage startups. Previously, he co-founded NerdWallet and served as COO for its first four years.

Julia Wise is a social worker based in Boston, MA. She writes about effective altruism at Giving Gladly.

See a list of former board members here.