If you could meet any person living or dead who would you choose and why ?
I would choose John Lennon because he had the ability "to change the world "
A decade ago, asked this question, by reply was His Emminence Cardinal Joseph Ratzinger, who was then Prefect of the Congregation for the Doctrine of the Faith, as I have a passionate interest in theology and he is one of the foremost experts in theology of the present day.
A decade later, I still would love to pick the brain of the same person for the same reason. Alas, he's now known as His Holiness Benedict XVI, and my chances of actually getting the chance to pick his brain probably are somewhere close to zero.