Irving Pike, MD. CMO of John Muir Health (Walnut Creek, Calif.). Dr. Pike was named the first CMO of John Muir Health in 2012. Prior to this appointment, he was a physician executive for Sentara Healthcare in Norfolk, Va., for 12 years. Dr. Pike is president of the Gastroenterology Quality Improvement Consortium and serves on the board of trustees of the American College of Gastroenterology.