Schnapper-Casteras served as a Trustee of the American University of Iraq from 2012 to 2017. In 2004, he founded the first student exchange program between Stanford University and postwar Iraq and he has commented on U.S.-Iraqi relations and international affairs in the Washington Post, Politico, DefenseOne, World Affairs Journal, and other newspapers.
He currently runs a boutique law firm, Schnapper-Casteras PLLC, and serves as a National Security Crisis Law Fellow at Georgetown University Law Center. Previously, he served as a law clerk on the U.S. Court of Appeals for the Fourth Circuit and on the U.S. Court of Appeals for the Armed Forces. He holds a JD with Pro Bono Distinction from Stanford Law School, an MPP from the Harvard Kennedy School, and an MA and BA with Honors from Stanford University.