He is still active, but how about Jerry White successor Rod Miller?
Bill Wolfer? Icken? Jack Ferris? Ed Alexander? Another great old gentleman Ed Duddy who was responsible for Microengineering code 148 track . Don't know if he did repower, but he was an innovator of a lot of stuff.
By the by, Henry's last name is spelled as Bob2 has it: Bultmann.
All the above on the theory, beggars can't be choosers.
One final thought: Suggest you ferret out a set of the late O Scale News. All that kind of stuff will be mentioned there, and buy the CD offered here for early 2 rail oriented issues of this Mag.