CNBC U.S. Contributors

Dr. Robert Epstein

Chief Medical Officer, Medco Health Solutions, Inc.

A Ph.D. of Harvard University, Robert Eptstein is a long-time researcher and professor, the former editor-in-chief of Psychology Today magazine, a contributing editor for Scientific American Mind, and a visiting scholar at the University of California, San Diego. He is the author of 14 books, including "The Big Book of Creativity Games."