Rosen is the son of Sidney and Estelle Rosen, both of whom are psychiatrists.[2] He has been married to Christine Rosen (formerly Stolba), a historian, since 2003. He graduated summa cum laude from Harvard University and was a Marshall scholar at Oxford University, from which he received a second bachelor's degree. He also has a law degree from Yale Law School.[2]
He is a professor of law at George Washington University Law School in Washington, D.C. and has been the commentator on legal affairs for The New Republic since 1992. Rosen is a Nonresident Senior Fellow at the Brookings Institution, where he speaks and writes about Technology and the Future of Democracy.[3] He often appears as a guest on National Public Radio, and is a frequent contributor to The New York Times Magazine