Irwin Johnson started the magazine. Probably in the early 50's.
Though maybe not intended in the beginning, the magazine attracted a lot of gay men. Johnson ( Rheo Blair) was in the closet at the time, as a gay man himself. Let's just say that most of the "bodybuilders" in the magazine were very young and not the most masculine.
When a teenager I had the opportunity to borrow a stack of the old Iron Man magazines (best BB'ing old school mag around, probably even today) from a old lifting friend of my uncles. A couple of Tomorrow Mans were in the mix, along with Strength & Health's (Bob Hoffman).
Johnson had some good ideas, even put out a training course. His "magic" protein blend, maybe a little bit too hyped, was his main fame. Had been told it was a low carb whey product, way ahead of it's time back then. Guy's would get results from if, losing fat in the process, but there were also mostly on a low carb diet also.
Good Luck