Randolph Mantooth was born on September 19 in Sacramento, California. His father worked in the pipeline construction industry and the family moved very often. Randy graduated from the American Academy of Dramatic Arts in New York City. Randy went on to play "Lieutenant Dorn" in the Virginian's episode "Regimental Line" in 1971. Randy was later offered the role of Firefighter/Paramedic Johnny Gage in a show called Emergency!, which was currently in syndication on TVLand until January, 2002. Randy also appeared on Adam 12, Operation Petticoat, Owen Marshall: Counselor at Law, Charlie's Angels, Vega$, The Love Boat, and Marcus Welby M.D.

After Emergency!, Randy went on to Soaps such as Loving, General Hospital, and The City. Randy has starred in many movies and mini-series such as Bridge Across Time, The Seekers, Vanished , and Enemy Action, and made guest appearances in Diagnosis Murder, JAG, The Promised Land, Battlestar Galactica, and Walker, Texas Ranger.