Original: Mullen is credited with inventing the flatground ollie, the kickflip (originally called the "magic flip") in 1983, the heelflip, the impossible, and a long list of other original tricks.
Simplified: He is credited with inventing many tricks, including the flat-ground Ollie (originally called the 'ollie pop'), the kickflip (originally called "magic flips"), the Heelflip, the 360 flip, and the Ollie Impossible (more often called the Impossible).