Prof. Dr. Wolfgang Schlegel studied Physics at the Free University of Berlin and the University of Heidelberg. He is the head of the Medical Physics department at the German Cancer Research Center (dkfz) in Heidelberg and Professor for Medical Physics at the University of Heidelberg. Prof. Thomas Bortfeld studied Physics at the Universities of Hannover and Heidelberg. He received his training in Medical Physics at the DKFZ in Heidelberg. He is now the Director of Physics Research in Radiation Oncology at the Massachusetts General Hospital in Boston, and Associate Professor at Harvard Medical School. Dr. Anca-Ligia Grosu studied medicine in Cluj (Romania) and received her MD in Radiation Oncology at the Technical University of Munich. She is the Head of the Brain Stereotactical Radiotherapy and Radiosurgery Group of the Department of Radiation Oncology at the Technical University and the Vice-President of the Neuro-Oncology-Group at the Tumour Center in Munich.