Cédric Villani is one of France's top mathematicians, working across several fields of the discipline. He's won a number of titles and awards for his work. A professor at Claude Bernard Lyon 1 University and member of France's Académie des sciences, Villani is also the author of the new book "Leçons de mathématique joyeuse" – literally "Lessons in joyful mathematics". He spoke to us in Perspective.