Cai Grau is Professor of Radiation Oncology at the Institute of Clinical Medicine at Aarhus University and heading the interdisciplinary radiotherapy research at the Danish Center for Particle Therapy at Aarhus University Hospital in Aarhus, Denmark. He is director of the national research center DCCC Radiotherapy (DCCCRT.dk) funded by the Danish Cancer Society and coordinator of the European Particle Therapy Network (EPTN). His main area of interest is research in head and neck oncology, high precision radiotherapy, proton therapy, and health economics in radiation oncology.