We booked him for my company's 10th Anniversary dinner Thursday July 4th this year - on the previous Monday the B757/TU154 midair over Switzerland occurred. We dithered over cancelling him - who'd want to hear jokes about ATC that week? In the end we stuck with it and he was brilliant - he handled the midair with great tact and sympathy and then went on with his incredibly funny flying/ATC reminiscenses - made the evening. I recommend that if you get the opportunity - go and see him.