Brian Andrew Leiser (better known as Fast, born 1972), is a member of the band Fun Lovin' Criminals,[1] plays bass, keyboards, harmonica, and the trumpet. He attended Horace Greeley High School in Chappaqua NY, graduating in 1990.

Brian's nickname (and stagename) is "Fast", which was given to him while attending Syracuse University. The name "Fast" is a shortened version of the nickname "Fastman" -- a reference to the speed at which he often spoke. Brian's start in popular music was as a keyboardist and backup singer for the Westchester, New York, 1980s synthpop group, Departure.