What is the name of House’s diagnostic fellow played by Jesse Spencer?

Jesse Spencer plays Robert Chase, one of Gregory House’s diagnostic fellows in House M.D. Chase is an Australian physician who joins House’s original diagnostic team at Princeton-Plainsboro.

Chase’s background and personality distinguish him from his colleagues. He initially appears more cautious about challenging authority and sometimes seems aligned with hospital management, but his diagnostic ability and independence develop over time. His shifting relationship with House is an important part of the team’s evolution.

Chase is a member of the original three-person team alongside Eric Foreman and Allison Cameron. The team changes repeatedly as the series progresses, and Chase eventually becomes a senior physician at the hospital. His career therefore extends beyond his initial role as a fellow.

Jesse Spencer is an Australian actor who was already known for the Australian soap opera Neighbours before House M.D. He later became associated with Chicago Fire, where he played firefighter Matthew Casey. Those later roles are separate from his portrayal of Chase.