From a New York Times obit by Richard Sandomir headlined “Ron Goulart, Prolific Writer Who Spanned Genres, Dies at 89”:

Ron Goulart, a prolific science fiction, fantasy, mystery and romance novelist who cast Groucho Marx as a detective and collaborated with William Shatner on a series of books set in the 22nd century, died in Ridgefield, Conn….

Mr. Goulart wrote at least 180 books — and that number may underestimate his output. His goal was to write as many books as Isaac Asimov, who at his death was credited with having written about 500.