Dr. Robert Chase, M.D. is a fictional character on the Fox medical drama House. He is portrayed by Jesse Spencer. His character was a part of the team of diagnosticians who worked under Gregory House until the end of the third season when House fires him. However, he resumed work at the hospital as a surgeon, and was re-hired by House in season 6. Robert Chase is the longest-serving member of House's staff. Chase has been attracted to Allison Cameron since season 3 of the show and embarks on a romantic relationship with her in "Human Error." In "Post Mortem," he left the Diagnostic Team after realizing he was in the same position as he was 10 years earlier, unlike all of the other former members of the team. However, in the series finale, he rejoins the hospital as the new Head of Diagnostic Medicine, replacing the (supposedly) dead House.