Hello David! Yes, Sugiyama sensei is my teacher along with Namiki Sensei
Wonderful men. I remember Sugiyama Sensei especially well. And his brother. Do you ever see Murai Sensei? He's up in his 90s now, I think. I hope his health is good. He is another wonderful person and a real treasure of aikido. It's a shame he has never been better publicized and I'm not aware of any interview or history that's ever been written of him, though I encouraged Stan Pranin to interview him.
Best to you.