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Professor of History, DePaul University

My research and writing focus on violent extremism (terrorism, insurgency, etc.), international security, and military history. I have published 12 books and numerous articles. While some of these publications address academics, others aim at a more general audience. Bridging the gap between the academic world and the educated, non-academic reader has been a major focus of my career. I am a contributor to The Hill, have blogged for the Huffington Post, and have had editorials published by the Chicago Tribune and the Chicago Sun Times. I provide frequent media commentary for local, national, and international television and radio.


  • –present
    Professor of History, DePaul University


  • 1988 
    University of Wisconsin Madison, Ph.D. History