In 2007 Byrne was featured in Time Magazine's list of 100 people who shape the world. She gained mainstream popularity and commercial success after appearing on The Oprah Winfrey Show. Her philosophy is that believing will allow you to achieve your wishes and dreams.
The Secret sold more than 19 million copies in more than 40 languages by the spring of 2007, as well as more than 2 million DVDs.The Secret book and film have grossed $300 million.
Byrne has also been a producer for Sensing Murder and has also worked on the Australian TV series World's Greatest Commercials and Marry Me.