Anthony Edwards Dr. Mark Greene Actor George Clooney Dr. Doug Ross Actor Sherry Stringfield Dr. Susan Lewis Actor Eriq La Salle Dr. Peter Benton Actor Noah Wyle Dr. John Carter Actor Julianna Margulies Head Nurse Carol Hathaway Actor Gloria Reuben Jeanie Boulet Actor Laura Innes Dr. Kerry Weaver Actor Christine Elise Actor Ron Eldard Actor Kathleen Wilhoite Guest Star Jameson Baltes Byron Guest Star William H. Macy Dr. David Morgenstern Guest Star Abraham Benrubi Guest Star Mary Mara Loretta Sweet Guest Star Ellen Crawford Nurse Lydia Wright Guest Star Yvette Freeman Nurse Haleh Adams Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star Andi Chapman Jodi Guest Star Antoinette Peragine Cindy Guest Star Michael Crichton Executive Producer John Wells Executive Producer