Evanier was president of a Los Angeles comic book club from 1966–69. In 1967, he suggested the titles of the officers of the Merry Marvel Marching Society. He made his first professional sale in 1969; that same year, through a mutual association with a Marvel Comics mail-order firm, he was taken on as a production assistant to Jack Kirby. Several years later Evanier began writing foreign comic books for the Walt Disney Studio Program, then from 1972 to 1976 wrote scripts for Gold Key Comics—including one memorable story, "The Greatest of E's", where he revealed that the E in Wile E. Coyote stands for "Ethelbert"—along with comics for the Edgar Rice Burroughs estate.