| GiveWell |
Co-Founder, Co-Executive Director (2006-08-01–2007-04-27); Co-Executive Director (2007-04-28–2008-01-03); Program Officer (2008-01-04–); Board Secretary (2008-01-04–2011-07-25); Co-Executive Director (2011-08-05–2017-06-01) |
Research Analyst (2015-09-01–2016-09-01) |
| Open Philanthropy |
Co-CEO (2021-06-01–); Project Lead (2014-08-01–2017-06-01); Chief Executive Officer (2017-06-01–2021-06-01); Co-CEO (2021-06-01–) |
Research Analyst (2015-08-01–2017-09-01); Program Officer, Global Catastrophic Risks (2017-09-01–2022-08-01); Senior Program Officer (2022-07-01–2023-07-01); Program Director (2023-07-01–) |
| Redwood Research |
Board Member (2021-01-01–) |
Advisor (2021-01-01–2022-09-22) |