Kim also wrote and/or produced songs for Warren Zevon, Kiss, Helen Reddy, Gene Vincent, Soft Machine, Cat Stevens, Alice Cooper, Leon Russell and Kris Kristofferson, and the Modern Lovers.
He also produced these hits:
1960 The Hollywood Argyles: “Alley Oop” - US #1
1962 B. Bumble and the Stingers: “Nut Rocker” - US #23, UK #1
1962 The Rivingtons: “Papa Oom Mow Mow” - US #48
1963 The Murmaids: “Popsicles and Icicles” - US #3
1966 Napoleon XIV: “They’re Coming to Take Me Away Ha-Haaa!”
This is true, he did have a track record. By today’s standards the man would be considered 100% legit.