Matt Czuchry Dr. Conrad Hawkins Actor Bruce Greenwood Dr. Randolph Bell Actor Emily VanCamp Nicolette Nevin Actor Manish Dayal Dr. Devon Pravesh Actor Shaunette Renée Wilson Dr. Mina Okafor Actor Malcolm-Jamal Warner Dr. AJ Austin Actor Jane Leeves Dr. Kit Voss Actor Glenn Morshower Marshall Winthrop Actor Tasso Feldman Dr. Irving Feldman Guest Star Denitra Isler Nurse Hundley Guest Star Michael Hogan Dr. Albert Nolan Guest Star Julianna Guill Jessie Nevin Guest Star Ian Gregg Mason Buck Guest Star Bethany Geaber Nurse Isabel Sharp Guest Star Radek Lord Grayson Betournay Guest Star Emil Beheshti Dr. Arthur Franklin Guest Star Blane Crockarell Young Conrad Guest Star Bailey Noble Laurie Dante Guest Star Denise Santos Mrs. Tannar Guest Star Adam Boyer Frank Tanner Guest Star Deep Rai Lab Tech Ricky Vaskell Guest Star Mike Forbs Tanspo Worker Harold Mabbot Guest Star Julia Campbell Vivian Guest Star Sean Weber Tarzan Guest Star Antoine Fuqua Executive Producer Amy Holden Jones Executive Producer David Boorstein Executive Producer Oliver Obst Executive Producer Phillip Noyce Executive Producer Todd Harthan Executive Producer Rob Corn Executive Producer