I exchanged a few letters with him back in, hmm the early- to mid-80s, very smart, easy to understand, courteous, and obviously a polymath. Besides his three books (beginning with "America B.C.") he had loads of papers in the ESOP (Epigraphic Society Occasional Publications) that were interesting. He grew up in New Zealand and was welcome among the various indigenous groups, and has indeed been dead a while now.
I subscribed to this “...ESOP (Epigraphic Society Occasional Publications) …” at one time. I may still have an old copy squirreled away somewhere.