@watchnerd, not directed to you in particular but to the conversation in general:
The "skinny Russian guy" has helped more than one SHW (super heavy weight) world champion powerlifter. Geoff has fat-burning, muscle-building, and strength-increasing programs.
I'm a music teacher - you can rest assured that I don't play or practice all the kinds of music some of my students like. I've also gotten to the point where, even in a room full of fellow musicians, sometimes people ask what my "main" instrument is because they assume everyone has a singular focus. (I'm sort of "entry level professional" at several of them, good enough to get paid and good enough to teach, but a long way away from world-class.)
It's kind of fun for me in the world of training/strength/conditioning because no one looks at me and thinks I look like a powerlifter, let alone one who holds some records for his age and weight. People watch me stretch and ask me if I do yoga, or they look at my build and assume I'm a runner. The best one was when someone watched me doing some hip mobility circles, which look sort of like belly dancing, and asked me if I was a dancer - my wife started laughing when she heard that someone might think I could dance.
Book, cover, don't judge.
-S-