As a topic of research and training expertise, terrorism has boomed since Sept. 11, 2001. Not coincidentally, the spigot of both government and private funding has been flowing wide open into the field. Thousands of potential sources now claim expertise in terrorism, from academics to think tanks to expert witnesses to for-profit firms that hawk anti-terrorism law enforcement or consumer products. (A Stanford University sociologist put together a research paper on the burgeoning subject–not terrorism, but terrorism experts: “The Rise of the Terrorism Expert: The Emergence of a New Field of Expertise.”) As always, journalists should be aware of the motivations of potential sources. This source list includes the RAND Corporation, the vast California-based nonprofit has one of the world's largest and most venerable terrorism research divisions, with dozens of experts on staff who can speak to a number of terrorism-related topics. It might be a good place to start in the non-government sector.