Robert Gregory Bourdon (born January 20, 1979) is an American musician , who is currently the drummer and one of the founders of the alternative rock band Linkin Park.

Rob was born in Calabasas, California where he grew up with members of Incubus. Rob grew up in a Jewish family.

Rob originally played piano, but started to play the drums in 4th Grade after watching an Aerosmith concert. His mother was the girlfriend of Joey Kramer, Aerosmith's drummer, so they were able to go backstage and see the entire production; Kramer also gave Rob a kick pedal.

In his early teen years, Bourdon played in a few bands with his friends. Rob also went to Agoura High School with fellow bandmates Brad Delson and Mike Shinoda and Rob and Brad played together for about a year in a band called Relative Degree. Their goal was to play at the Roxy Theatre, after achieving their goal with a sell-out show, Relative Degree eventually broke up.

Rob's previous job before Linkin Park was a waiter.