It's Clark Dunham, and I think that was a partner segment with Doug DuBay, as Dunham built the layout which was on display at Doug's store in Des Moines. I was able to see that one in person.
As long as we are talking about Dunham Studios creations, the Twin Cities Model Railroad Museum was given a Dunham layout, by a private party who had commissioned it. Museum volunteers went out to California, opened a hole in the side of the house and removed the layout, then put the wall back. The layout has since been reworked, so it better fits the museum space.
You gotta hand it to Tom, he managed to capture a lot of toy train related things, which are no more, so that everyone can still enjoy them, long after they're gone.
