He is an Australian Grand Prix Dressage Rider, one of our 'top', is on the Olympic Squad at this stage, been to WEG and other major international competitions on one of his stallions, Regardez Moi.
Some like his riding, some don't. Personally, I'm not into riding with my fists up around my ears, and he's quite forceful in much of his training. He also screwed over a friend of mine in buying one of his horses, which, don't get me wrong, was absolutely stunning, but very far from what he advertised it as.
Decent enough bloke I guess, and I'm sure people would take some good advice home from a clinic with him, but he's just not mu cup of tea