I was fortunate before Gates Rubber Co. jumped ship in Denver for Arkansas and Canada, to know John Redmond, head of the Harley program for Gates, and Ralph Duke, head engineer in Gate's Pilot Plant (their R&D facility) in the Synchronous Belt Division, on old So. Broadway. I met Phil Ross several times over there, and I thought he was a great guy - totally into and loving what he was doing.
There's a great article from Easyriders reprinted over on the SuperMax website that gives the complete history of Phil's work with both Gates Rubber, and H-D in developing not only the primary belt drive, but the secondary belt drive that has been a standard on the full BT Harley line since '86.
Although Phil died in Dec. '09, after a brave battle with cancer, his wife still carries on the full SuperMax line. You owe it to yourself to go here: