Today’s New York Times Sunday Book Review includes Daniel Kahneman’s Thinking, Fast and Slow in its 10 Best Books of 2011, calling Kahneman the “world’s most influential psychologist.”
I don’t have a best selling book or any where near that degree of influence but I can claim one degree of separation. I took the author photo:

I photographed Daniel in 2004 as part of what I call my academic trading cards – a series of portraits shot for Princeton’s Woodrow Wilson School. The photo is being used for the book and its promotion.