Peter Warren Singer is Senior Fellow and Director of the 21st Century Defense Initiative at the Brookings Institution. He is the youngest scholar named Senior Fellow in Brookings' 90-year history. In 2005, CNN named him to their "New Guard" List of the Next Generation of Newsmakers. Singer has also been recognized by the Financial Times as "Guru of the Week" for the thinker that most influenced the world that week and by Slate Magazine for "Quote of the Day." In his personal capacity, Singer served as coordinator of the Obama-08 campaigns' defense policy task force.

His first book Corporate Warriors: The Rise of the Privatized Military Industry pioneered the study of the new industry of private companies providing military services for hire, an issue that soon became important with the use and abuse of these companies in Iraq. His next book, Children at War explored the rise of another new force in modern warfare, child soldier groups. Dr. Singer's "fascinating" (New York Post) and "landmark" (Newsweek) work was the first book to comprehensively explore the compelling and tragic rise of child soldier groups and was recognized by the 2006 Robert F. Kennedy Memorial Book of the Year Award.

His third book, Wired for War looks at the implications of robotics and other new technologies for war, politics, ethics, and law in the 21st century. Described as: "An exhaustively researched book, enlivened by examples from popular culture" by the Associated Press and "awesome" by Jon Stewart of the Daily Show,  Wired for War made the New York Times non-fiction bestseller list in its first week of release. It has already been featured in the video game Metal Gear Solid 4: Guns of the Patriot, as well as in presentations to audiences as diverse as the Air Force Institute of Technology to the National Student Leadership Conference.

Prior to his current position, Dr. Singer was the founding Director of the Project on U.S. Policy Towards the Islamic World in the Saban Center at Brookings. He has also worked for the Belfer Center for Science and International Affairs at Harvard University, the Balkans Task Force in the U.S. Department of Defense, and the International Peace Academy. Singer received his Ph.D. in Government from Harvard University and a BA from the Woodrow Wilson School of Public and International Affairs at Princeton University.