In House M.D., what specialty does James Wilson practice?

In House M.D., James Wilson practices oncology.

Wilson is the head of oncology at Princeton-Plainsboro Teaching Hospital and Gregory House’s closest friend. His specialty means that many of his patients have cancer, while his personal role in the series often involves balancing compassion with the difficult realities of serious illness. Wilson’s approach contrasts with House’s: he is generally more socially aware and emotionally open, though he can also make ethically complicated choices.

The friendship between Wilson and House is central to the show. Wilson repeatedly challenges House’s behavior, helps interpret his motives, and sometimes enables his destructive habits. Their relationship is not merely professional; the two share apartments, arguments, jokes, and major life decisions across the series.

Oncology is sometimes confused with hematology or other cancer-related specialties. In the show, Wilson is specifically identified as an oncologist, though real-world oncologists may work in medical, surgical, or radiation-focused areas. Robert Sean Leonard played Wilson throughout the series, but this question asks for the character’s medical specialty.