He is a member of the high-octane sketch comedy powerhouse OSFUG, which has been selling out shows each month at the Upright Citizen's Brigade Theatre East Village for over two years. He is also a member of The Trumpet Boys, which currently has a run of their musical sketch comedy show called "An Evening With The Trumpet Boys" at the Upright Citizen's Brigade Theatre Chelsea. Mark performs stand-up throughout the city as well, and hosts the monthly stand up show, "The Loud Boys Show" at Pianos on the Lower East Side.