John Rodney Mullen (born August 17, 1966) is a professional skateboarder, company owner, inventor, and public speaker who practices freestyle and street skateboarding. Mullen is credited with inventing numerous skateboarding tricks, including the flatground ollie, kickflip, heelflip, impossible, and 360-flip (or Tre-flip). Mullen has appeared in more than twenty skateboarding videos and has co-authored an autobiography, entitled The Mutt: How to Skateboard and Not kill Yourself, with writer, Sean Mortimer.