Franck Jedrzejewski is a mathematician and Doctor in philosophy and musicology. He has published over a dozen titles, including Ontology of Categories (Ontologie des Catégories, 2011), research in music theory (Mathematical Theory of Music, 2006, Looking at Numbers, 2013, with composer Tom Johnson), and in the history of sciences and mathematics (aleatory models and probabilistic physics). A second edition of his Dictionnaire des Musiques Microtonales (2004) was recently published (2014). His research is highly transdisciplinary (music, philosophy, mathematics, categories, atonality, russian avant-garde music). He currently teaches at Université de Paris-Sud and the INSTN (the National Institute for Nuclear Science and Technology).