Villaseñor began his career in the industry as a driver for television producer Don Fedderson in the 1950s. Villaseñor worked in the editorial department at Don Fedderson productions for some ten years, after which Fedderson offered him a position as an assistant editor. As an assistant editor at Don Fedderson Productions, Villaseñor worked on such television series as Family Affair (which starred Brian Keith) and My Three Sons as a Sound Editor.