​Peter Macintosh Firth (born 27 October 1953) is an English actor. He is best known for his role as Sir Harry Pearce in the BBC One programme Spooks; he is the only actor to have appeared in every episode of the programme's ten-series lifespan. He has given many other television and film performances, most notably as Alan Strang in Equus (1977), for which he won a Golden Globe Award and received an Academy Award nomination. He’s also best known for the films Tess, The Hunt for Red October, Amistad, Pearl Harbour, and for playing spymaster Harry Pearce in the BBC TV series Spooks and its movie spin-off Spooks: The Greater Good.