At the ACLU he has helped sue the government over the Muslim Ban, arbitrary termination of DACA grants, prolonged imprisonment of refugees, and the imprisonment of immigrants on the basis of poverty alone. David is also a Ph.D. candidate in political science at Stanford, where he is on leave; his dissertation uses government data to track the effects of immigration enforcement policies. Before graduate school, David worked at the International Center for Transitional Justice in Cape Town, South Africa and the Innovations for Successful Societies project at Princeton University.