Before assuming his current position, he was the Executive Director of the American Inns of Court Foundation in Alexandria, Virginia. He had previously served as the Deputy Chief Counsel for Operations at the FAA. Prior to his FAA appointment, Warren served in the U.S. Army Judge Advocate General's Corps, from which he retired in 2007 after having been selected for promotion to Brigadier General.
A native of Tampa, Florida, Warren received both a B.A. (1978) and J.D. (1981, with honors) from the University of Florida; an LL.M. (1993) from The Judge Advocate General's School, U.S. Army (TJAGSA), Charlottesville, Virginia; and a Master of Strategic Studies (2002) from the U.S. Army War College, Carlisle Barracks, Pennsylvania. He is a member of the bars of Florida, the Court of Appeals for the Armed Forces, and the U.S. Supreme Court; and co-holder, with the late Colonel Waldemar A. Solf, of the Solf-Warren Honorary Chair in International and Operational Law, TJAGSA. He is a Professorial Lecturer in Law (Adjunct Professor) at The George Washington University Law School. He was the American Bar Association Outstanding Young Army Lawyer, received the Florida Bar Association Clayton B. Burton Award of Excellence, and is in the University of Florida Hall of Fame.
Commissioned as an ROTC Distinguished Military Graduate, his military schooling includes the Infantry Officer Basic Course; Judge Advocate Officer Basic, Advanced, and Graduate Courses; Command and General Staff College; U.S. Army War College; and Airborne, Air Assault, Jumpmaster, Pathfinder, and High Risk SERE Schools.
He served as the Special Assistant to The Judge Advocate General and as the Staff Judge Advocate (senior attorney) for Combined Joint Task Force 7/Multi-National Forces in Iraq, V Corps in Iraq and Germany, and the 101st Airborne Division (Air Assault). He was the Legal Advisor for the Joint Special Operations Command; Regimental Judge Advocate for the 11th Armored Cavalry Regiment; and served in numerous other assignments as a Judge Advocate in the United States, Germany, Grenada, Bosnia, Kuwait, and Iraq, including on the faculty of the International and Operational Law Department of TJAGSA. His awards and decorations include the Distinguished Service Medal, Defense Superior Service Medal, Legion of Merit, Bronze Star Medal, Defense Meritorious Service Medal, and Meritorious Service Medal; and the Master Parachutist, Pathfinder, and Air Assault badges. He was the Editor of the Operational Law Handbook and has published articles in the Army Lawyer, Military Law Review, Naval War College International Law (Blue Book) Series and various other military and legal professional publications.