De Bonvoisin was born in New York to French and Belgian parents. As a child, she attended five schools around the world and lived in six countries on three continents. By her early teens she was an international swimmer in Hong Kong. She can speak four languages...English, French, German and Spanish.

In January 2001, de Bonvoisin summited Mount Kilimanjaro and in December 2002 she accompanied a group of students to Antarctica. She has also gone cage diving with great white sharks in South Africa, and has been a ski instructor .

She currently lives in New York City.

After graduating from the London School of Economics at 19, de Bonvoisin joined the Boston Consulting Group, where she worked in more than a dozen countries. [1] She then earned an MBA from Stanford University and moved to New York to work for the media giants BMG and Sony. In 2000, Time Warner tapped her to become the managing director of a new $500 million digital-media venture fund.

She left the corporate world to spend time in Africa working for a nonprofit, and she was a senior advisor on the book A Day in the Life of Africa created by author/editor David Elliot Cohen. She had a short stint working on the Charlie Rose show.

De Bonvoisin is also a certified trainer for the Anthony Robbins Companies, teaching at dozens of seminars on many subjects, including health, relationships, finances, life skills and spirituality.

De Bonvoisin began working on First30Days.com in 2006, after noticing that there was no single resource to help people through the initial period after a major change. She received major funding for First30Days from former Time Warner CEO Richard Parsons, Hearst Interactive Media, New York City Investment Fund and a number of angel donors.

In May 2008, HarperOne published her book, The First 30 Days: Your Guide to Making any Change Easier". She was subsequently interviewed about the book on the Today Show on NBC and the Early Show on CBS.