Nidhal Guessoum is an astrophysicist. He obtained his PhD (and MSc) from the University of California at San Diego (USA) and spent several extended periods as a researcher at NASA's Goddard Space Flight Center. He has also had long on-going collaborations with French colleagues, resulting in many papers, mostly in gamma-ray astrophysics. He is currently Professor and Associate Dean at the American University of Sharjah, UAE.