Colonel Warren C. Cook Jr. was born in Boston in 1975 and commissioned in May 1998 after graduation from Williams College with a B.A. in history.

From 1999-2001 he served in the 1st Marine Division as a Platoon and Company Commander in the 2d Battalion, 4th Marines, deploying with the 31st Marine Expeditionary Unit.

In 2001, he reported to 1st Marine Expeditionary Brigade, where he served as Aide to the Commanding General and Commander Task Force 58 during operations in southern Afghanistan. In 2002, he transferred to 1st Marine Division, where he served as Aide to the Commanding General during Operation Iraqi Freedom.

From 2004-2006, he was assigned to The School of Infantry at Camp Pendleton, CA, serving as a Company Commander and the Instructor Group Officer-in-Charge.

From 2006-2008, Colonel Cook returned to the 1st Marine Division and served as a Company Commander with 3d Battalion, 1st Marines during Operation Iraqi Freedom.

 In 2008, he reported to 2d Battalion, 1st Marines, and deployed to Iraq, as a Military Transition Team Leader, advising Iraqi Security Forces in the Al Anbar Province.

From 2009-2012 Colonel Cook commanded Recruiting Station Los Angeles.

From 2013-2014 he served as the Junior Aide de Camp to the Commandant.

From 2014-2016, he served in the Indo-Pacific Command’s Strategy and Policy Directorate as a posture planner.

From 2016-2019, Colonel Cook commanded 2d Battalion, 4th Marines, executing a Marine Rotational Force Darwin deployment.

From 2019- 2020 he served as a National Security Affairs Fellow at the Hoover Institution, Stanford University.

In June 2020, Colonel Cook reported to Marine Corps Recruiting Command to serve as the Assitant Chief of Staff G-3

In July of 2022, Colonel Cook reported to the 8th Marine Corps District to serve as the Commanding Officer.

Colonel Cook is a graduate of the U.S. Army Infantry Captain Career Course, the Weapons Tactics Instructor Course, the U.S. Naval Command and Staff College, and the Joint Forces Staff College. He recently served as a National Security Affairs Fellow at the Hoover Institution, Stanford University.