Lewis leads Open Philanthropy’s strategy for Farm Animal Welfare. Prior to joining Open Philanthropy, he worked as Policy Advisor & International Liaison to the CEO at The Humane Society of the United States (HSUS). Prior to that, he was a litigation fellow at HSUS, a law student, and an associate consultant at Bain & Company. He has a B.A. from Harvard University in Social Studies and a JD from Yale Law School.