Any clue who this christian man is?

There is a man/preacher who goes around to universities in New England and speaks of Jesus and Christianity. I have seen him on local television on Sunday mornings and he recently attended my university. College students gather around and listen to him speak, but most of all the kids like to try and stump him with their own questions. Often he gets debated. I am really interested in what he has to say, but I do not know who he is. He is a tall and thin older man, about 55, with curly brown hair. If any one knows, thank you!