Researcher at APC (Astroparticule et Cosmologie), Paris 7 University. Research areas are cosmology, dark matter, dark energy. Has been a member of EROS (gravitational microlensing), CDMS (cryogenic dark matter search), Archeops (CMB balloon experiment), SNLS (Supernovae legacy survey). Currently active member of SDSS-II/BOSS (Baryon oscillation spectroscopic survey) and LSST (large synoptic survey telescope). Side interest in egyptian archaeoastronomy.