Mandy Patinkin Dr. Jeffrey Geiger Actor Adam Arkin Dr. Aaron Shutt Actor Christine Lahti Dr. Kathryn Austin Actor Thomas Gibson Actor Vondie Curtis-Hall Dr. Dennis Hancock Actor Roxanne Hart Actor Peter MacNicol Actor Peter Berg Dr. Billy Kronk Actor, Director Jayne Brook Dr. Diane Grad Actor Héctor Elizondo Dr. Phillip Watters Actor Mark Harmon Dr. Jack McNeil Actor Rocky Carroll Dr. Keith Wilkes Actor Ron Silver Guest Star John DiMaggio Guest Star Vanessa Williams Guest Star Sam Sorbo Guest Star Kathryn Harrold Guest Star Amie Carey Guest Star Mae Whitman Guest Star Maggie Murphy Guest Star John Tinker Executive Producer, Writer Michael Dinner Executive Producer Bill D'Elia Director Lou Antonio Director Stephen Cragg Director James C. Hart Director Oz Scott Director David Amann Writer Josh Reims Writer Nicole Yorkin Writer Jennifer Levin Writer Tim Kring Writer Marcelle Clements Writer Ian Biederman Writer Dawn Prestwich Writer Robert Burgos Writer Linda Klein Writer Sara B. Charno Writer