I was lucky enough to help with Dr. Kahneman's talk at Google, and part of that was being in the group that had lunch with him.

I asked him, "Dr. Kahneman, you've been writing about thinking for 40 years. Do you think you've had any impact on the way people think?"

He said, "No, not even my own!" He proceeded to relate an anecdote where his daughter had internalized his teachings better than he himself had.

Well, he's changed the way I think, for sure.