Brian Clark is a member of The Jim Henson Company's Puppet Up! - Uncensored improv troupe, joining in 2007. Clark also performs William A. Mummy on the Henson Alternative game show Late Night Liars. Recently, he has been a performer for Neil's Puppet Dreams.

Clark has written for numerous animated series such as "Yokies", "Baydogs" and "The Children of Toromiro" and been seen in numerous commercials. He also co-wrote and created the pilot series "That Gay Ghost" for Logo. He is a co-founder of the famed sketch comedy group, "The Deviants" and is an alumni of the Groundlings Theater Sunday Company. Clark holds a master's from NYU in television writing and gender studies.