Daniel L. Byman (born 1967^[1]) is an American political scientist. His research focuses on terrorism, Counterterrorism and the Middle East.^[2] Byman is currently a professor in Georgetown University's Walsh School of Foreign Service and director of Georgetown's security studies program^[3] He is a former Vice-Dean of the school.

Byman is Senior Advisor to the U.S. Department of State as part of the International Security Advisory Board, a senior fellow with the Transnational Threats Project at the Center for Strategic and International Studies, and the Foreign Policy Editor for Lawfare.^[4]

Byman played key roles in the post 9/11 intelligence committees and in many distinguished think tanks. He was a senior fellow at the Center for Middle East Policy at the Brookings Institution.^[5] He was also the research director of the Center for Middle East Public Policy at the RAND Corporation.^[6]

He is also the lead course instructor for Georgetown's massive open online course on Terrorism and Counter Terrorism.

Byman holds a BA from Amherst College and a PhD from Massachusetts Institute of Technology.^[7]

Byman was a professional staff member on both the 9/11 Commission and the Joint 9/11 Inquiry staff of the House and Senate Intelligence Committees.

Early in his career, he served as an analyst for the U.S. government.^[8]

Byman's book Road Warriors: Foreign Fighters in the Armies of Jihad, published by Oxford University Press in 2019, provides a sweeping history of the jihadist foreign fighter movement. He also authored the book, Al Qaeda, the Islamic State, and the Global Jihadist Movement: What Everyone Needs to Know, published by Oxford University Press in 2015.^[9]

His most recent book is Spreading Hate: The White Power Movement Goes Global (Oxford, 2022).^[10]

• Trends in Outside Support for Insurgent Movements. Rand Corporation. 2001. ISBN 978-0-8330-3052-8.
• Keeping the Peace: Lasting Solutions to Ethnic Conflicts. JHU Press. 2002. ISBN 978-0-8018-6804-7.
• The Dynamics of Coercion: American Foreign Policy and the Limits of Military Might. w/ Matthew Waxman (co-author). Cambridge University Press. 2002. ISBN 978-0-521-00780-1.{{cite book}}: CS1 maint: others (link)
• Deadly Connections: States that Sponsor Terrorism. Cambridge University Press. 2005. ISBN 978-0-521-83973-0.
• Things fall apart: containing the spillover from an Iraqi civil war. w/ Kenneth M. Pollack (co-author). Brookings Institution Press. 2007. ISBN 978-0-8157-1379-1.{{cite book}}: CS1 maint: others (link)
• A High Price:The Triumphs and Failures of Israeli Counterterrorism. Oxford University Press, US. 2011. ISBN 978-0-19-983174-6.
• "The Wobbling Red Line in Syria", op-ed, New York Times. May 4, 2013. "Empty threats weaken America's credibility", regarding President Obama's "red line" comment on Syria's chemical weapons.
• Road Warriors: Foreign Fighters in the Armies of Jihad. Oxford University Press. 2019. ISBN 978-0-19-064651-6.

• Appearances on C-SPAN