Picking up acting as a second career later in life, Allan Arbus was initially known for being a photographer. Married to famed photographer Diane Arbus, the pair built up an extensive business in the late 1940s and early 1950s, shooting artwork for fashion magazines like Glamour and Vogue. After the pair divorced, Arbus moved to California to try his hand at acting. He quickly won roles in two Robert Downey Sr. films, Putney Swope (1969) and Greaser's Palace (1972). Soon after, he landed his most memorable role, Major Sidney Freedman, the psychiatrist on-duty at the 4077th Mobile Army Surgical Hospital, on M*A*S*H. Arbus was never a regular cast member, only appearing as a recurring guest star, which left him free to pursue other projects, frequently appearing as a guest star on a number of TV shows like The Odd Couple, Taxi and Starsky and Hutch. His final on-screen appearance was in an episode of Curb Your Enthusiasm in 2000. Arbus passed away in 2013 at age 95.