The Japanese Simenon?
From Daily Yomiuri:
Mystery novelist Jiro Akagawa has given a whole new meaning to the word “prolific,” having dashed off an amazing 500 books since his first novel appeared in 1977, it has been learned.
In addition to his 16 main series, he has written various other works, churning out 10 to 20 books each year.
“I didn’t particularly have a target of 500 novels in mind, but the number of my publications just kept growing. I don’t know if I can make it to the 600th novel, but as long as readers wait for my works, I’d love to continue writing,“Akagawa said.