Robertson was born in La Jolla, California, the son of Clifford Parker Robertson Jr. (1902–1968) and his first wife, Audrey Olga Robertson (née Willingham; 1903–1925). His Texas-born father was described as "the idle hei… See more

Robertson studied at the Actors Studio, becoming a life member. In the early 1950s he worked steadily in television, including a stint as the lead of Rod Brown of the Rocket Rangers (1953–1954). He appeared in Broadway i… See more

In 1977, Robertson discovered that his signature had been forged on a $10,000 check payable to him, although it was for work he had not performed. He also learned that the forgery had been carried out by then-… See more