Kip,
I think you mean Arthur C Clarke ,(Charles C Clark is a proffesor of Orthopaedic Surgery!!) but you've got an excuse, you are old like me!!
Now you've got me looking for copies of his books!! I can remember reading some of Asimov 's but that seems so long ago I cannot remember any of the titles! Carl Sagan, also brilliant, if only more people took onboard some of the things he said.
Warby