Adam Arkin Dr. Aaron Shutt Actor Mandy Patinkin Dr. Jeffrey Geiger Actor Christine Lahti Dr. Kathryn Austin Actor Héctor Elizondo Dr. Phillip Watters Actor Peter Berg Dr. Billy Kronk Actor Vondie Curtis-Hall Dr. Dennis Hancock Actor Jayne Brook Dr. Diane Grad Actor Mark Harmon Dr. Jack McNeil Actor Rocky Carroll Dr. Keith Wilkes Actor Stacy Edwards Dr. Lisa Catera Actor Joanna Kerns Guest Star Bob Bancroft Guest Star Jason Beghe Guest Star Mae Whitman Guest Star Kathryn Harrold Guest Star George Newbern Guest Star Scott MacDonald Guest Star Todd Allen Guest Star Venessia Valentino Guest Star Ariel Felix Guest Star John Tinker Executive Producer Bill D'Elia Executive Producer, Director Michael Dinner Executive Producer Lou Antonio Director Stephen Cragg Director Rob Corn Director David Semel Director Michael Schultz Director Dawn Prestwich Writer Barbara Hall Writer Ian Biederman Writer Tim Kring Writer Patrick R. Norris Director Josh Reims Writer David Amann Writer Jennifer Levin Writer Remi Aubuchon Writer Nicole Yorkin Writer John J. Sakmar Writer