Don't really know how to get in touch personally with him, but the best way would be to catch him at a race track. I believe he's at Chelsea Auto Legends this weekend, and will probably be at Goodwood Revival in 2 weeks time. Does mean you'd have to travel to England to meet him.
Or come over for something like Goodwood Festival Of Speed next year, he may well be there again
Don't know if he does any of the historic stuff in Europe, but obviously he still has close ties with Porsche and may still do the odd bit for them.