Born 16 June 1953 in Wimbledon, South West London, England.

British drummer who has played with Gentle Giant on their 1972 album Three Friends.

Mortimore also worked with Spike Heatley, Tom Jones, Troy Tate, Ian Dury, G.T. Moore, Mick and Chris Jagger, Frankie Miller, Oliver Jones, Barney Kessel, Arthur Brown and Brian James among others.

In 2009, along with Gary Green and Kerry Minnear, he set up the live project Three Friends, performing the music of Gentle Giant.