Grant Sullivan was born in Nebraska and raised in southern California. He served in the US Navy during World War II, after which he entered Carnegie Tech (now Carnegie Mellon) to study drama. He proceeded on to New York City to pursue his acting career. He starred in many television productions and Broadway plays. In the early 1960's he starred in the television series Pony Express. It was during this time that stunt rider Boyd Morgan taught him to ride horses. His acting career spanned from 1952 to 1968. In the 1970's he began his second career in real estate. With his wife of 42 years by his side, Grant died peacefully at his home in Laguna Beach, California at the age of 86.