In House M.D., James Wilson practices oncology and heads the hospital’s oncology department.
Wilson is one of House’s closest friends and serves as a major contrast to House’s abrasive diagnostic style. As an oncologist, he treats patients with cancer and often brings a perspective focused on communication, empathy, and long-term care.
The character is played by Robert Sean Leonard. Wilson’s professional expertise is also central to several storylines, including cases involving cancer diagnoses and the ethical difficulties of telling patients and families about serious illness.
A common mix-up is to identify Wilson as a general physician because he frequently advises House on cases outside oncology. The show also gives him administrative and personal roles, but oncology remains his defining medical specialty throughout the series.