Philip Starr, MD, PhD, is a professor of neurological surgery at the University of California, San Francisco, and the director of the Functional Neurosurgery program, one of the most active programs for implantation of deep brain stimulation devices in the Western USA. He has performed over 100 of such surgeries. He was the first researcher to use the intraoperative electrocorticography method to study how parts of the brain communicate with each other during movement disorders. In 2013, he pioneered the method that allows recording brain activity in an outpatient setting using an implanted device. In his research, he aims to answer the following questions: 1) How do movement disorders and their treatment change the communication between different parts of the brain, and 2) How disorders of thought and mood change the activity of the parts of the brain responsible for these functions (called cognitive and limbic circuits, respectively). To answer these questions, his laboratory study brain activity over short and long periods of time using both invasive and noninvasive recording methods.