there wasn't much i could find out about this guy but here is something i found on this blog
"Known simply as Kaplan for his two recordings in the 60s for Philips, Kaplan Kaye comes from showbiz stock with his father being comedian and actor Davey Kaye, and his sister being actress Melody Kaye. Kaplan started off in acting, performing in Midsummer Night's Dream on stage and in 60s radio drama 'The Dales'.
In the 70s Kaplan worked in an A&R capacity at DJM records, as well as releasing several singles under his own name. He now runs a successful entertainment booking agency."