I was lucky to be given a lecture on FM synthesis by John Chowning himself during his visit of my home town about 20 years ago. As a kid that grew up playing a Yamaha DX11, that was a great moment.
As a kid who grew up playing a DX27S and an FB-01, I once had dinner with John Chowning and Max Matthews at Max’s house. Unfortunately they served tomato aspic, so I was too busy trying to wash that down with sips of water to ask the questions about FM synthesis and optimization that I really wanted to ask. Which mostly involved which crazy tricks they had to use to pack six operator FM synthesis onto whatever ridiculously primitive DSPs they had back in those days. By that time, John had moved on to studying physical modeling synthesis, and I lost track of the field after that.