CPT Keith Gauthier was born in Grand Junction, Colorado. He is a 2005 graduate of the Northern Arizona University with a Bachelors of Science in Criminal Justice.
CPT Gauthier joined the Marine Corps in 1997 and completed a four year enlistment as a Mortarman with the 1st Battalion 7th Marines. Upon completion of his enlistment he attended college and commissioned through Officer Candidate School as an Infantry Officer and was assigned to the 1st Infantry Division with the 1st Battalion 26th Infantry in Schweinfurt, Germany. In 2006, CPT Gauthier deployed to Baghdad, Iraq in support of Operation Iraqi Freedom as a Mechanized Platoon Leader.