No, Mark's still going strong. Literally and figuratively. The 6 Valvoline car is pretty much the car scheme he's known best for. Well... that and the 6 Phizer/Viagra... He never really retired. Just jumped around part to full time and back again as he pleased. He's driven for quite a few since his last year in the 6 car in 2006.
Now for the compliment. Ironically, the guy in your avatar sorta reminds me of Boris Said. The hair anyway, hehe. The Asimov quote is a plus.