I should think the Conservatory(official name is the Conservatoire National Superior de Musique)would have that information. I know that when Tournier retired the class was split between Pierre Jamet and Lily Laskine. I can give you the details and reasons for that if you need it. Laskine left around 1957 and her class was taken over either by Jacqueline Borot or Gerard Devos. Then when Jamet retired in 1963, one of the two above mentioned names took his class. I think Borot replaced Laskine and Devos replaced Jamet, but I’m not sure. Marie-Claire Jamet took over when one of the two, Borot or Devos, retired, and when the other teacher retired, the class went back to one teacher. When Marie-Claire retired, Isabella Moretti took over and is currently there.