WHO?:Dr. Allison Cameron, played by Jennifer Morrison.
CAREER: Specializes in Immunology at Princeton-Plainsboro. During the first three seasons, Cameron practiced as a fellowship with Dr. House. At the end of the third season, Cameron decides to resign from her position and leaves with her boyfriend. However, in the fourth season Cameron returns as a member of the ER staff at Princeton-Plainsboro.
FAMILY LIFE: Dr. Cameron has one older brother and was widowed at the age of 21. Her marriage to her husband was only six months in duration until his tyroid cancer spread to his brain.