Harvard psychology professor Daniel Gilbert is widely known for his 2006 best seller, Stumbling on Happiness. His work reveals, among other things, the systematic mistakes we all make in imagining how happy (or miserable) we’ll be. In this edited interview with HBR’s Gardiner Morse, Gilbert surveys the field of happiness research and explores its frontiers.

A version of this article appeared in the January–February 2012 issue of Harvard Business Review.