Thomas W. Doeppner, Ph.D. is vice chair of Brown CS, the director of Brown’s CS Master’s Program, the director of Undergraduate Studies, and the head of Brown’s CS Undergraduate TA Program. Interested in operating systems and everything related to them, he wrote one of the first threads packages for Unix and has dabbled in threads and concurrency ever since. More recently, he worked with wireless devices and mobile computers. He is currently interested in the area of operating system support for security.