Professor of Political Science, director of the Center for Ethics in Society, co-director of the Center on Philanthropy and Civil Society, and associate director of the Institute for Human-Centered AI.

He is the author of System Error: Where Big Tech Went Wrong and How We Can Reboot (with Mehran Sahami and Jeremy M. Weinstein) and Just Giving: Why Philanthropy is Failing Democracy and How It Can Do Better (2018); Digital Technology and Democratic Theory (edited with Lucy Bernholz and Hélène Landemore, 2021). His teaching and writing these days focuses on ethics, policy, and technology.