A native of Stone Mountain, Georgia, Colonel Grass graduated from the United States Naval Academy and was commissioned a Second Lieutenant in 1989.
Following graduation from the Basic School and the Infantry Officers Course, he was assigned to 3rd Platoon, Bravo Company, 1st Battalion, 9th Marines, Camp Pendleton, California where he deployed with the 15th MEU(SOC) to the Persian Gulf. Following a six-month assignment as a raid instructor at the 1st Marines Regimental Enhanced Training Section (RETS), he was reassigned to Bravo Company as the Executive Officer and deployed with the 13th MEU(SOC) to the Western Pacific and Somalia.
Promoted to Captain in 1994, he transferred to Expeditionary Warfare Training Group, Pacific (EWTGPAC), Coronado, California, where he served as the Officer in Charge of the Amphibious Raid Branch and trained West coast small boat raid companies until 1997.
Graduating from Amphibious Warfare School (AWS) in 1998, he assumed command of Weapons Company, 2nd Battalion, 6th Marines, Camp Lejeune, North Carolina. Following promotion to Major in 1999, he assumed duties as Operations Officer, BLT 2/6 and completed a deployment with the 24th MEU(SOC) to the Mediterranean Sea and Kosovo. Upon return from deployment, he assumed duties as Battalion Executive Officer until May 2001.
Completing Marine Corps Command and Staff College by correspondence and earning his Master’s Degree at the Naval Post Graduate School, Monterey, California in June 2003, he reported to Marine Corps Systems Command, Quantico, VA where he served as Team Lead for the development of the Complimentary Low Altitude Weapon System (CLAWS). He was promoted to Lieutenant Colonel in November 2004.
From June to December 2005, he led a joint Military Transition Team at Kirkush Military Training Base in the Diyallah Province, Iraq. Upon his return, he served as Optics Team Lead and Deputy Program Manager in the Infantry Weapons Systems Product Group at Marine Corps Systems Command until June 2006.
From July 2006 to June 2007, he was assigned as Operations Officer at the newly-formed Marine Corps Special Operations School, Marine Corps Forces Special Operations Command (MARFORSOC), Camp Lejeune, North Carolina where he was responsible for standing up schoolhouse operations and conducting formal training for the first several Marine Corps Special Operations Companies.
From Jul 2007 to Jan 2009, he commanded 2nd Battalion, 2nd Marines and deployed to Al Qaim, Rawah and Anah, Iraq in support of Operation Iraqi Freedom 8.2.
Upon his change of command, he assumed duties as the Executive Officer of Regimental Combat Team 2 and deployed to the Northern Helmand Province in Afghanistan in support of Operation Enduring Freedom 10.1/10.2.
In July of 2011, he reported to back to MARFORSOC, and after a brief stint as G-7-Exercises, assumed command of the Marine Special Operations Regiment. He was promoted to his current rank in September 2011.
Colonel Grass is married to the former Teri Priefer and they have three daughters named Alisha, Brenna Kate and Caroline and two hounds; Gus and Auggie.