Which fictional character is House M.D.’s head of oncology and closest friend?

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

Played by Robert Sean Leonard, Wilson provides a compassionate counterpoint to Gregory House. He treats cancer patients, values personal relationships, and frequently challenges House’s decisions, but he also remains loyal to him through professional disputes and personal crises. Their friendship is one of the series’ most important continuing relationships.

Wilson’s position as an oncologist gives the character a medical specialty that naturally brings him into contact with difficult cases and serious ethical questions. He also served in administrative roles at Princeton-Plainsboro, including as a member of the hospital’s leadership. His marriages and relationships became recurring storylines as the series progressed.

The character’s first name is James, although House often calls him “Wilson.” Viewers may also confuse Wilson with the members of House’s diagnostic team, but Wilson is primarily the oncology specialist and House’s friend rather than one of House’s regular fellows.