I've never met him but recommended to me by a girl whos horses backs I do. He trains her and competes her stallions and she said would be good for lessons when I was looking. (And I'm a wimpy eventer, dont jump over 3'3" SJ unless life depends on it!)
He does clinics at Keysoe where I keep my boys, but I haven't had time to go to one of his sessions yet. Have heard very good reports though. One of the other liveries here has a horse with him so she really rates him.