http://www.sennaya.com/images/dostoevsky310.jpg
After seeing my avatar, some of you are maybe confused; is he trying to meet himself? No...
My pick would surely be Fyodor Mikhailovich Dostoevsky, in my opinion; the greatest writer ever, and I doubt that anyone could ever become close to his genius.
We would meet in some quite place, big room with big armchairs, shelves around us filled with books( that's my imaginary personal library :D )
I would go down on my knees and I would tell him: Thank you!
He was a gambler and boozer, so after some roulette( i hate that play, I really don't understand why is anybody playing it) we would start our chat, with a lot of vodka in front of us.
I would ask him did he ever killed anybody because I don't understand how could he describe Raskolnikov so good, why didn't he finished those two novels what he started to write, what does he think about mushrooms in Anna Karenina, does he believe in happiness, does he believe in destiny or everything happens by an accident...
I doubt that 12 hours would be enough for everything, and on his way out he would give me 500 novels which he never published, just for me!:)