In 1960, he married Lyda Arco, an artists' representative and aficionado of drama. She was a Russian descended from a line of actors in the Yiddish theatre who ran a salon in Chelsea, NY. They stayed together till Long's death in 1994, but had no children. Long described himself as an "agnostic." Referring to Lovecraft, Long wrote that he "always shared HPL's skepticism . . . concerning the entire range of alleged supernatural occurrences and what is commonly defined as 'the occult.'"