Marc Sageman is the author of two critically acclaimed books — Understanding Terror Networks (University of Pennsylvania Press, 2004) and Leaderless Jihad (UPP, 2007). As an expert on Al Qaeda and related terrorist organizations, he has consulted with various branches of the U.S. government and has lectured at many universities, including Harvard University, MIT, the University of Chicago, the University of California at Berkeley, and Johns Hopkins. He has also consulted with foreign government (France, Australia, Spain, Canada, Germany, and Britain) and lectured extensively at foreign universities.
Sageman obtained an M.D. and a Ph.D. in sociology from New York University. After a tour as a flight surgeon in the U.S. Navy, he joined the Central Intelligence Agency in 1984. He spent a year on the Afghan Task Force then went to Islamabad from 1987 to 1989, where he ran the U.S. unilateral programs with the Afghan Mujahedin, and New Delhi from 1989–91. In 1991, he resigned from the agency to return to medicine. Since 1994, he has been in the private practice of forensic and clinical psychiatry.