Robert Gregory Bourdon (born January 20, 1979) is an American musician, best known as the drummer and co-founding member of the American rock band Linkin Park.
The youngest member of the band, Bourdon met Aerosmith drummer Joey Kramer, and was inspired to learn how to play the drums. After joining his high school's jazz band in his sophomore year, he met Brad Delson and Mike Shinoda, who both lived nearby in the San Fernando Valley. Bourdon and Delson would form their own band, Relative Degree.