sentences:  He spent the summer of 1956 at Bell Labs, where he exchanged ideas with a variety of condensed matter theorists, including Philip W. Anderson and Walter Kohn He received his Ph.D. from the University of Paris in 1957 for the work he carried out at Princeton.In 1957 Nozières was appointed the assistant director of the physics laboratory at the École Normale Supérieure.In 1958 his academic career was interrupted when he was drafted by the French navy.