I looked it up, he wrote a book 'Them and Us"

From the blurb: "...Neanderthal Predation (NP) theory reveals that Neanderthals were 'apex' predators - who resided at the top of the food chain, and everything else - including humans - was their prey..."

https://www.amazon.com/Them-Us-Neanderthal-predation-created...