Joseph "Joe" Hahn (born March 15, 1977), better known by his stage name, Mr. Hahn, is an American turntablist and director best known as the DJ for the band Linkin Park.
A Korean American, Hahn was born in Dallas, Texas and grew up in Glendale, California. He began deejaying in high school, and attended Art Center College of Design in Pasadena, California. In college, he met Mike Shinoda, and joined his band Xero, which later became known as Linkin Park. Hahn became the first Korean American to receive a Grammy when the band won the 2002 award for Best Hard Rock Performance.
Hahn and Shinoda guested in The X-Ecutioners' hit single "It's Going Down".  Hahn also guested in Shinoda's Fort Minor album The Rising Tied.
Hahn has directed several of Linkin Park's music videos, such as those for "Numb", " From the Inside", "Somewhere I Belong" ,"Pts.Of.Athrty and Bleed it Out". He has also directed videos for Story of the Year, Xzibit, and Alkaline Trio. In a 2003 interview, he told MTV that film-making was his true passion, and that "doing the music [was] more of an extra thing".
Outside of his work in music, Hahn provided special effects work on The X-Files and the miniseries Frank Herbert's Dune. He also directed a short film called The Seed, and acquired the rights to produce a film adaption of China Miéville's novel King Rat.