Gallucci returned to Georgetown University as dean of the Edmund A. Walsh School of Foreign Service on May 1, 1996. In March 1998, the Department of State appointed him as special envoy to deal with the threat posed by the proliferation of ballistic missiles and weapons of mass destruction, a position which he held until January 2001. As a dean at Georgetown University, Gallucci recommended conservative Douglas J. Feith to a 2-year faculty position which Feith occupied in the fall of 2006, a move which generated protests from some liberal faculty and students. In 2015, Gallucci became director of The John W. Kluge Center at the Library of Congress.