Constantinos Koumenis, Ph.D. is an Associate Professor, Vice Chair and Research Division Director and Co-Leader, Radiation Biology & Imaging Program at the University of Pennsylvania, School of Medicine. Amato Giacca,Ph.D., is a Professor and Director of the Department of Radiation Oncology, Leader of Radation Biology and Molecular Therapeutics Program at the Stanford Cancer Center. Ester Hammond Ph.D., is a Junior Group Leader at Gray Institute for Radiation Oncology and Biology at Oxford University.