Donald Joseph Qualls (born June 10, 1978) is an American actor, producer, and model. He is best known for his work in films including Road Trip, The New Guy, Hustle & Flow, and The Core and for several appearances on television series such as Breaking Bad, Supernatural, Scrubs, Lost, CSI: Crime Scene Investigation, and The Big Bang Theory. He co-starred in the FX comedy series Legit, and is co-starring in the Syfy horror series Z Nation. He was cast in the Amazon Studios show The Man in the High Castle.
He is also known as Donald Joseph Qualls and Donald Joseph "DJ" Qualls.