Ah, Bob Henry. I never got an answer to the questions I sent him, maybe I scared him away or something.
When he contacted me he told that he was born in the USA, where he lives now, but at some point he used to live in England (which is perhaps why Guisti says he was English?) and he had released several music records in both USA and UK (with under a different name in each country, pseudonym in the USA and real name, which is not Bob Henry, in the UK). He also said he directed two movies, both of which were never released because of some lawsuit thing... Can't remember the names right now but I did a search on them last year and actually found some old pre-release magazine ads for both of them (the movies aren't listed at the IMDB) with his name listed as a director. One had Stanley Cortez as a cinematographer.
Also mentioned having acted on some episodes of Gunsmoke, Cheyenne and others.
Thats pretty much what I can remember right now, but there wasn't much more I'm sure.