The Parkinson's Disease and Movement Disorders Clinic at UCSF is the largest center for the surgical treatment of Parkinson's Disease in Northern California. Dr. Phillip Starr, co-director of UCSF's Functional Neurosurgery programs, is a pioneer in using deep brain stimulation (DBS) to treat dystonia. Starr, along with surgeon Dr. Paul Larson, are investigators for the largest clinical trial of Parkinson's treatment through DBS currently taking place in North America.