Wow - this is a nice page. Yep - that man is simply HS&G. As far as the Japan picture, at first I didn't think that looked like Glenn's autograph because he usually doesn't make his 'F's like that. But after closely studying it, I changed my mind. He does sometimes change the way he forms of some of his letters when he signs his name, especially the f, r, and e in Frey. The rest of it looks like his handwriting as well.
And OBTW - Congratulations on your 2000th post, GA.