He is the author of numerous papers and author/editor of several books, including Global Jihad: The Future in the Face of Militant Islam (reviews of which are accessible here)  and Understanding Islamist  Terrorism.
He is a prolific writer, having authored numerous papers and co-authored several books, including "Global Jihad: The Future in the Face of Militant Islam" (which has reviews available online) and "Understanding Islamist Terrorism."