Don Fuller was a busy model and aspiring actor active in physique photography circles in the mid-1950's. He was known to have worked for Bob Mizer of AMG, Bruce of LA, Chuck Renslow of Kris, R.A. Enterprises (Apollo), and probably some I don't know about. Mizer described him in his model notes as bisexual, an accomplished hustler, sexually versatile, “a glutton,” and also fond of girls. Like I said, one very busy guy . . . and very good looking, so it's Don Fuller day!
The photographer of this picture is unknown, at least to me.