Along with business partner, Jack Canfield, Hansen is best known for creating what Time magazine called "the publishing phenomenon of the decade".
In 2005 he co-wrote, along with Robert Allen, the book "Cracking the Millionaire Code" in which he highlights several self-made millionaires such as Bob Circosta, Michael Dell, Bill Gates, Alexander Graham Bell, Oprah Winfrey, and others, using them as examples of how to build wealth.