Seeking Heppenheimer

Hello. I'm the newest member of this group (thanks for approving my
application).

I was recently reading Colonies In Space by T.A. Heppenheimer. Can
anyone here tell me if Mr. Heppenheimer is still around and active in
this community? I think I'd like to contact him is possible.

Thank you!

John Cserep
Valparaiso, Florida