I would suggest works by Dr. Marc Sageman. He is a Clinical and Forensic Psychiatrist, who is a former CIA officer. His most recent book (2004) is "Understanding Terror Networks," which focuses on the Salafist Jihadi movement and relies heavily on biographical data of some 150+ jihadists.
He also has a series of testimonies and prsentations available through a variety of sources (CSPAN, etc.)
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