I am staff astrophysicist at Laboratoire Univers et Particules de Montpellier part of Montpellier University located in the city of Montpellier.

My scientific interests: My research activity covers different fields of astrophysical research: high-energy (X- and gamma-ray) astrophysics, radiative transfer and particle acceleration in compact objects (jets and accretion disc coronae), radiative transfer in special and general relativity, cosmic-ray research: the sources of cosmic rays, the propagation of cosmic rays in the interstellar medium, magneto-hydrodynamic turbulence in the interestellar medium. More recently, I have also been involved in the physics of young stars (jets and accretion). I am using analytical (kinetic theory, magnetohydrodynamic), numerical (magnetohydrodynamic, particle-in-cell, Monte-Carlo) methods as well as some modeling (one zone model of high energy sources).

I was coordinating a french national research agency project named MACH (a french acronym for MicroAstro Choc) dedicated to the study of the microphysics of particle acceleration at collisionless shocks.

I am part of the High Energy Stereoscopic System (HESS) collaboration since 2004, part of the Cerenkov Telescope Array (CTA) collaboration since 2011. Since 2013 I am member of the e-astrogam consortium and follow /support the amego project. I support the participation of France to the Square Kilometer Array (see the french white book).

I am managing a French community Cosmic Ray research website gathering articles, educative material.