Before becoming a federal prosecutor, Garrison was a prosecutor in the United States Marine Corps. He also received the United States Army Judge Advocate General School's trial advocacy award. Now a lieutenant colonel in the Marine Corps Reserve, Garrison served as Deputy Legal Counsel in the Office of the Chairman of the Joint Chiefs of Staff at The Pentagon.[4]
From 2007 to 2018, he served as an Assistant United States Attorney in the Western District of Missouri, prosecuting interstate and international drug trafficking, money laundering, murder, and other offenses. He is a recipient of the Missouri Bar Foundation award for appellate advocacy before the United States Court of Appeals for the Eighth Circuit.[2]
U.S. Attorney
On February 16, 2018, President Donald Trump announced his intent to nominate Garrison to be the U.S. Attorney for the Western District of Missouri.[2] On February 27, 2018, his nomination was sent to the Senate.[5] On April 26, 2018, his nomination was confirmed by voice vote.[6]
On February 8, 2021, he along with 55 other U.S. attorneys were asked to resign.[7] On February 11, Garrison announced his resignation effective February 28.[3]