Marcia Gay Harden as Dr. Leanne Rorish, an ER attending physician, known to current and former Residents as "Daddy". Her husband and two children were killed after their car was hit by a drunk driver; this sometimes influences her medical decisions. Originally the ER's Residency Director, Leanne is promoted to Director of Emergency Medicine following the death of Gina Perello, though is replaced in this capacity by Dr Campbell in "Second Year".