With a scientific background, Olivier Crouzet got a Master degree as an IT engineer. During scholarship, he acted both as a technical assistant and a teaching assistant. After 2 years as system administrator in the 3rd French Internet service provider, he joined Nicolas Sadirac to develop during the last ten years a well-known IT school witch became a French leader with 4000 students. He designed the pedagogical model, and made it evolve. Based on this educational success, a new IT school '42' is created in 2013, along with Nicolas Sadirac, Kwame Yamgnane and Florian Bucher, promoting an even more advanced training methodology, called Peer-Learning. Olivier Crouzet designed this model: 100%-project-based, without any teacher, lecture, nor knowledge transfer. Students debate, exchange ideas, try, fail, try again, to reach the goal, and finally evaluate their peers. Founded and funded by Xavier Niel, owner of one of the four french telecom company, '42' is totally free for the students. In this spirit of social opening, Olivier Crouzet, while still evolving the pedagogical model of the school, is also promoting evolution in the French education system through various conferences.