Eric Foreman is the neurologist among Gregory House's original diagnostic team members in House M.D.
Omar Epps played Foreman, who joined the original team with Robert Chase and Allison Cameron. Foreman's neurological expertise became especially useful in cases involving the brain and nervous system, while his skeptical and ambitious personality frequently placed him in conflict with House.
Foreman later became more senior within Princeton-Plainsboro and eventually served as the hospital's Dean of Medicine. His career therefore extends beyond his initial role as a fellow learning House's unconventional diagnostic process.
Robert Chase is a cardiologist and intensivist who later specializes in surgery, while Allison Cameron is an immunologist. James Wilson is an oncologist and is not one of the original three fellows, making Eric Foreman the specific answer to this question.