Professor DiIulio directs Penn’s Robert A. Fox Leadership Program and Program for Research on Religion and Urban Civil Society. He also serves, amongst several other roles, as advisor to Penn doctoral candidates in fields including political science, social work, education, and city planning. Prior to joining the Penn faculty, he taught at Harvard and Princeton. Among a dozen other books, he is the author of Godly Republic: A Centrist Blueprint for America's Faith-Based Future (University of California Press, 2007).  He has won each of Penn's most prestigious teaching awards, the Lindback and the Abrams.

Outside academic life, Professor DiIulio has advised presidential candidates in both parties as well as serving on several bipartisan government reform bodies. and co-founding several national community-serving programs including the faith-based Amachi program for mentoring the children of prisoners. He also served as the first director of the White House Office of Faith-Based and Community Initiatives.