In House M.D., which specialty does Dr. James Wilson lead?

Dr. James Wilson leads the oncology department in House M.D.

Wilson is played by Robert Sean Leonard and serves as Gregory House's closest friend. His medical specialty contrasts with House's diagnostic medicine: oncology focuses on cancer, its diagnosis, treatment, and the care of patients affected by malignant disease.

Wilson is generally more empathetic and socially conventional than House, which makes their friendship one of the series' central relationships. He often challenges House's decisions, helps interpret his behavior, and sometimes becomes involved in the consequences of House's choices. Their bond remains important even when House's conduct strains it.

A frequent mix-up is identifying Wilson as a diagnostician because he regularly assists House. However, his established hospital role is head of oncology. Robert Sean Leonard remained a principal cast member throughout the show's eight-season run.