Yes, and he was also a ginormous prick.
He told a fan who wrote him fan mail "if you want to thank me for my work, then stop writing to me, because you've interrupted me for having to answer your letter."
He got banned from the campus of Texas A&M for calling their ROTC cadets "the next generation of American fascists".
He mailed a dead gopher to someone who pissed him off.
He was notoriously litigious over perceived plagiarism, most notably regarding Terminator, claiming it stole from I Have No Mouth And I Must Scream, and an Outer Limits episode he wrote, "The Soldier From Tomorrow".
He groped a woman on stage at a convention.
Don't look up to him. He was a bastard to his bones.