Thomas Joscelyn is a senior fellow at the Foundation for Defense of Democracies and senior editor of The Long War Journal, a widely read publication dealing with counterterrorism and national security issues. Much of his research focuses on how al Qaeda and its affiliates operate around the globe. Mr. Joscelyn was the senior counterterrorism adviser to Mayor Rudy Giuliani during his 2008 presidential campaign. He has testified before Congress on numerous occasions, including before the Senate Foreign Relations Committee, House Homeland Security Committee, House Foreign Affairs Committee, and House Judiciary Committee. Mr. Joscelyn is also a frequent contributor to The Weekly Standard. His work has been published by a variety of other publications and cited by the Associated Press, Reuters, The Washington Post, USA Today, TIME, Foreign Policy, and many others.