Seriously?

I've met a few in my time. I love conventions but hate standing in line to meet guys for five seconds, so most of my meetings have been casually.

Alex Ross(Chicago-con)
Kevin Smith(also Chicago-con)
Mark Allessi(he stayed in a hotel room next to ours at Chicago-con)
George Perez(casually, great guy)
Jeff Smith(casually as well, also great guy)
Neil Gaiman(at a signing for his book)