LeJohn was signed by the Brooklyn Dodgers in 1954 and played in the minor leagues through 1971 with various Dodgers affiliates. He was a minor league All-Star in 1954, 1955 and 1964. LeJohn made one stop in the majors, with the Los Angeles Dodgers in 1965 and had one at-bat as a pinch-hitter in the World Series that year. He struck out swinging in the ninth inning of game 1.
LeJohn started managing as a player/manager with the Tri-City Atoms in the Northwest League in 1967 and continued to manage in the Dodgers' farm system for twenty years after he finished playing.