Glen Ellis Friedman is an American photographer and artist. He became known for his activities within rebellious skateboarding and music cultures. Photographing artists Fugazi, Black Flag, Dead Kennedys, Circle Jerks, Minor Threat, Misfits, Bad Brains, Beastie Boys, Suicidal Tendencies, Slayer, Run-DMC, KRS-One, and Public Enemy, as well as classic skateboarding originators Tony Alva, Jay Adams, Alan Gelfand, Duane Peters, and Stacy Peralta, among others.

Tony Alva is an American skateboarder, entrepreneur, and musician. He was a pioneer of vertical skateboarding and one of the original members of the Zephyr Competition Skateboarding Team, also known as the Z-Boys. The Transworld Skateboarding Magazine ranked him eighth in its list of the "30 Most Influential skateboarders" of all time.