For all things TRH(P)S-related: RockyMusic: The Musical World of Rocky Horror + The Rocky Horror Picture Show: The Offcial Fan Site!
Richard O'Brien (born Richard Smith 25 March 1942) is an English actor, television presenter, writer and theatre performer.
He wrote the musical The Rocky Horror Show and later presented the television show The Crystal Maze. O'Brien also co-wrote the screenplay of the film adaptation, The Rocky Horror Picture Show released in 1975, and appeared in the film as Riff Raff. The stage show has been in almost continuous production. He is also the voice of Lawrence Fletcher, the title characters' father in Phineas and Ferb.
O'Brien became a citizen of New Zealand in 2011, also retaining his British citizenship.