In House M.D., which actress played immunologist Allison Cameron?

Jennifer Morrison played immunologist Allison Cameron in House M.D.

Cameron was part of Gregory House’s original diagnostic team and was distinguished by her immunology background. She often approached patients with compassion and was more willing than House to consider the emotional and ethical dimensions of medical decisions.

Her contrasting outlook created a recurring professional tension. House valued evidence and diagnostic efficiency, while Cameron was more likely to advocate for a patient’s wishes or question the human consequences of a proposed course of action. The show used those disagreements to explore how doctors balance judgment with empathy.

Morrison later became known for other major television roles, including Emma Swan in Once Upon a Time. In House M.D., Cameron’s departure from and later return to the diagnostic team formed part of the program’s evolving staff history.