I had the pleasure of visiting his garage two years ago for a Hagerty/Tom Cotter event. One thing that impressed me is the diversity of his collection from brassies through race cars. The other is that he has acquired duplicate engines for some of his rarest cars, with the original engine on display next to each car. So he gets to drive them hard if he wants without worrying about doing potentiasly catastrophic damage to the original.
He was a welcoming host as well, and the RK Motors side where business is done was also impressive.