Mathew Alfred Best is an American internet personality, entrepreneur, and a former United States Army Ranger. Best joined the United States Army shortly after graduating high school, eventually serving five deployments with the 2nd Ranger Battalion, before working as a private contractor for the Central Intelligence Agency. He operates a popular comedy-centric YouTube channel, has starred in a self-made movie, and published a best-selling book, a memoir of his military service written with two other authors. Best is also a co-founder of Black Rifle Coffee Company.