​From Wikipedia, the free encyclopedia Brian Backer (born December 5, 1956) is an American actor who has starred in film and on television. He is best known for his role in the 1982 hit comedy film Fast Times at Ridgemont High as shy teenager Mark "Rat" Ratner. His other films include the 1985 comedy film Moving Violations (playing the role of Scott Greeber) and the 1987 comedy film Police Academy... see more