Not terribly familiar. All I really know is that he refers to the fallen angels as nephilim. I understand it differently as the nephilim being the offspring of the fallen angels. Also that he has a theory about the pyramids being built by them, I think. There's probably a lot I would agree with in his books and a lot I wouldn't. I started learning of nephilim at a pretty young age, just not from a Christian perspective back then.
Hello Rosemarie...i have only read parts of "The Nephilim and the Pyramid of the Apocalypse." which i found online. I don't know a great deal about him or his research and theories. I will do my best to look into that further in the near future. If you would like to share some of what you've gathered from his works or ask a question on a specific theory, feel free.