His thesis, directed by Mary K. Gaillard, is entitled Theoretical and Phenomenological Aspects fo Gauge Theories.
From 1990 to 2003 he was a professor at Paris-Sud University (Paris XI) in the Laboratory for Theoretical Physics (from 1999 as Professeur de classe exceptionelle).
Under his directorship the APC Laboratory invested heavily in and developed the necessary technical resources for space-based projects of the Centre national d'études spatiales (CNES) and the European Space Agency (ESA).
[5] He told a reporter for Les Echos that because gravitational waves reach us intact from their place of emission, ce sont des messagers parfaits (they are perfect messengers).
He was one the most important French scientists advocating France's engagement in space-based searches for gravitational waves.
[5][4] He developed with George Smoot the Massive Open Online Course (MOOC) entitled Gravité!