Marin County Physicians Many of our physicians are recognized leaders in their field. Using state-of-the-art technologies, we provide a wide range of diagnostic imaging and therapeutic services including neurologic imaging, orthopedic imaging, three-dimensional computed tomography (CT), ultrafast magnetic resonance imaging (MRI), and interventional radiology. We utilize the latest, start-of-the-art technology, and have a sophisticated teleradiology network to enhance our 24-hour coverage. Lisa O. Ballehr, D.O. Derek A. Burdeny, D.O. Vida A. Campbell, M.D. Dary H. Chinn, M.D. Jana J. Crain, M.D. William J. DeMartini, M.D. Russell C. Fritz, M.D. Chad Goodman, M.D. Charles P. Ho, M.D., Ph.D. Betsy A. Holland, M.D. Jay A. Kaiser, M.D. Ralph M. Koenker, M.D. Brian K. Nagai, M.D. Dennis S. Orwig, M.D. Janaki N. Ramanathan, M.D. Damon Sacco, M.D. Brian J. Salmen, M.D. Eric D. Smith, M.D. David W. Stoller, M.D. Robert L. Wirth, M.D.