Don,
I studied Music Ed at Temple and had a few voice "lessons" there, but it was more of a diction class than anything else. To be honest, the best thing I ever did for my voice was learn the clarinet. Just like Mr "S", the wind instrument taught me to breathe, phrase and make music out of the notes. That's hard to teach with just words.
You played trumpet, didn't you? That probably taught you more about breathing than you knew !

I was always a strong swimmer, never smoke or drank either. All those things help the pipes !