He began his acting career in 2008 when he played a character in the direct-to-DVD film The Cult of Sincerity.
He has appeared in television series such as Mom, Don't Trust the B**** in Apartment 23, Onion SportsDome and Fresh Off the Boat. He appeared as Rudy Truitt in the drama series Hart of Dixie for 10 episodes. He also played Philip, a servant (later butler) of the Thompson House, in the HBO series Boardwalk Empire.
Hobby played the role of Pastor Jeff Difford, a pastor of the church in the CBS television series Young Sheldon. For the first two seasons, he was a recurring character, but he was promoted to the main cast, starting with the third season.