Who is the head of oncology and House’s closest friend in House M.D.?

James Wilson is the head of oncology and House’s closest friend in House M.D.

Robert Sean Leonard portrays Wilson, who works at Princeton-Plainsboro and treats patients with cancer. His medical specialty contrasts with House’s diagnostic role, but Wilson frequently becomes involved when House needs advice, protection, or a personal reality check.

Their friendship is one of the series’ central relationships. Wilson is patient and empathetic where House is abrasive and suspicious, yet Wilson repeatedly enables House’s behavior and shares responsibility for their unusual lifestyle and schemes.

Wilson’s personal life supplies major storylines, including multiple marriages and his relationships with patients and colleagues. Later episodes reveal that he has terminal thymoma, a diagnosis that shapes the final season and House’s decisions.