Jonathan has made over 350 television appearances in his career. Among them was the role of Marvin Palmer in the 1964 Perry Mason episode, "The Case of the Blonde Bonanza." To advance his acting career, Goldsmith moved to California from New York in 1966. Like many aspiring actors, he found it difficult to gain enough acting work to survive and wound up working various jobs, including driving a garbage truck and working in construction, to help make ends meet.