Jonathan Hafetz is an American lawyer and writer. Hafetz is Professor of Law at Seton Hall Law School. Hafetz formerly worked as a senior attorney for the National Security Project of the American Civil Liberties Union". He is notable for volunteering to serve to assist Guantanamo captives to access the US Justice system. He has also served as a lawyer for Ali Saleh Kahlah al-Marri, who from 2003 to 2008, was the sole "enemy combatant" held in extrajudicial detention in the continental USA. Prior to his career at the ACLU, Hafetz served as Litigation Director for the Liberty and National Security Project at the Brennan Center for Justice at NYU School of Law and as a Gibbons fellow in Public Interest and Constitutional Law at Gibbons, P.C.. He was also a law clerk to both Jed S. Rakoff of the U.S. District Court for the Southern District of New York, and Sandra L. Lynch of the U.S. Court of Appeals for the First Circuit. Hafetz is a graduate of Yale Law School. From 2014-15, Hafetz was a Visiting Professor in the Law and Public Affairs Program at Princeton University.