[7] Hahn began deejaying in high school,[10] and he studied illustration at the Art Center College of Design in Pasadena, California.

[8] In college, he met Mike Shinoda and joined his band Xero, which would release its self-titled demo album in 1997.

[11] Hahn also guest starred in Shinoda's Fort Minor's debut album The Rising Tied on the song "Slip Out the Back".

Hahn has directed several of Linkin Park's music videos, such as those for "Numb", "From the Inside", "What I've Done", "Somewhere I Belong", "Pts.OF.Athrty", "New Divide", "Bleed It Out" and "Iridescent".

[16] Hahn directed the trailer for the video game Medal of Honor, featuring Linkin Park's single "The Catalyst".

[19] As of April 2012, Hahn directed a film adaptation of Eric Bogosian's Mall, based on the novel, which stars and is executive produced by Vincent D'Onofrio.