- Harvard Business Review
March 2014

- The New York Times
January 17, 2014

- The New York Times
July 5, 2013

- The Boston Globe
November 17, 2012

- The New York Times
July 14, 2012

- The Boston Globe
September 17, 2011

- Freakonomics
August 1, 2008

- Freakonomics
July 30, 2008

- Freakonomics
July 28, 2008