He has been involved in teachers basic training in France and Africa and in-service teacher training in France. He is a member of the Institute for Research in Mathematics Education (IREM) of Rennes and the IREM National Committee "Epistemology and History of Mathematics" and is author and co-author of several books about the history of mathematics. His most recent work on Tartaglia's solution of cubic equations Questions et inventions diverses Livre IX ou l'invention de la résolution des équations du troisième degré is published by Hermann, Paris.