Joe joined Linkin Park, after meeting fellow band mate Mike Shinoda in art school, when the band was called Xero in 1996 as the band's turntablist. Since then, he has directed music videos for most singles of his band, with the exceptions of "One Step Closer", "Crawling", "Faint" and "Given Up". He is referenced to as Mr. Hahn at the beginning of "Cure for the Itch" from Hybrid Theory as well as in "And One" from Hybrid Theory EP and "Kyur4 TH Ich" from Reanimation. He has also remixed their songs "With You" and "Cure for the Itch" (originally on "Hybrid Theory"), which appear on the remix album Reanimation as "Wth>You" and "Kyur4 Th Ich".
On the 2006 album Minutes to Midnight, Joe Hahn focused his contributions on programming with his sound effects board and MIDI keyboard. Minutes To Midnight also features his turntable talents on three tracks: "What I've Done", "Valentine's Day", and "In Pieces." Joe has been known to utilize MIDI pads on several tracks from the band. Examples include "Crawling", "Numb", and "Points of Authority".
A proficient music video director, Joe has directed videos not only for his band Linkin Park, but he has also directed videos for Static-X, Story of the Year, Xzibit, X-Ecutioners and Alkaline Trio. Hahn has also done some special effects for the TV show The X-Files.
In 2005 to 2006, while bandmates Chester Bennington and Mike Shinoda were busy with side projects, Hahn shot a short film called The Seed in Los Angeles, California, released in March 2008 and premiered at the Pusan International Film Festival. Hahn also appeared with a minor role in a short film by Filip Engström called Little Pony. In 2005, Hahn opened a retail concept store and brand Suru, located on the famous Melrose Avenue in Los Angeles.
He has also been noticed to have gained weight from the previous albums. He is currently attending a gym near his shop SuRu.