There are multiple artists named Gavin Harrison:
1. Gavin Harrison - A psychologist of rhythm no less, born in Harrow, North London; Harrison's early influences stem from his father's jazz collection.
Besides playing on records by Kevin Ayers, Lisa Stansfield, and Iggy Pop, Harrison produced two books, Rhythmic Illusions and Rhythmic Perspectives, and replaced Chris Maitland in Porcupine Tree. Most recently he has joined King Crimson.
2. Gavin Harrison (Suffolk UK) - composes music and sound FX for games, TV and film.
Web Site: http://gavinharrisonsounds.com/