Richard O'Brien (born Richard Smith; 25 March 1942) is an English actor, television presenter, writer and theatre performer. He was born in England, and is a dual citizen of New Zealand and the United Kingdom.
O'Brien wrote the musical stage show The Rocky Horror Show, which has remained in almost continuous production. He also co-wrote the screenplay of the film adaptation, The Rocky Horror Picture Show released in 1975, appearing in the film as Riff Raff. O'Brien also appeared in the hugely popular ITV series Robin of Sherwood in 1986, as Gulnar, alongside Jason Connery. He presented the television show The Crystal Maze for Channel 4 from 1990 to 1993 and is the voice of Lawrence Fletcher, the title characters' father in Phineas and Ferb.