Derek Shepherd

As Head of Neurosurgery, Derek Shepherd earned the nickname McDreamy by the female staff of Seattle Grace. Seen as the lead male, he is known for his tortuous love-life. Initially he moved to Seattle Grace to get away from his adulterous ex-wife (Addison Montgomery) and his deceitful best friend (Mark Sloan). He subsequently began a long romance with Meredith Grey which resulted in their marriage. Recently he had a somewhat antagonistic relationship with Richard Webber who he believed wasn't governing the hospital appropriately. He is now acting as the Chief of Surgery after going to the hospital board about Chief Webber's drinking problem.