Senior Scientist at Deutsches Elektronen-Synchrotron (DESY), Zeuthen site, Germany, where he leads the accelerator division and heads the Photo Injector Test facility (PITZ). Since 2008, he has served as the Speaker of the PITZ Collaboration, comprising over a dozen international institutions. He holds a PhD in experimental particle physics from the University of Siegen, Germany, and has extensive experience in accelerator physics, high-brightness electron sources, and radiation safety. Dr. Stephan has supervised over 20 PhD students and 30 postdoctoral researchers and actively contributes to international committees in the field of radiotherapy, including the VHEE Radiotherapy Workshop series, FRPT conference series, and ESTRO FLASH focus group. His current work is at the forefront of FLASH radiotherapy and very high energy electron (VHEE) beam applications.

Dr. Daria Boscolo is a staff physicist in the Biophysics Department at GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt. Her work focuses on charged particle radiation, with a primary emphasis on advancing particle therapy.

Her research spans multiple areas, including FLASH radiotherapy, where she has made both theoretical and experimental contributions. She investigates the nanoscopic mechanisms underlying the FLASH effect at the radiation-chemical level, explores dosimetric approaches to enable carbon ion FLASH therapy, and supports preclinical studies aimed at validating its feasibility in clinical settings.

Professor at the University of Santiago de Compostela (USC) (Spain). Founder and director of the Radiation Physics Laboratory at USC (SDL) dedicated to radiotherapy research and calibration.

Author of more than 100 scientific and technical documents and director of 9 doctoral thesis. His main research line is dedicated to the development of new therapy modalities and dosimetry instrumentation. Along his career he has contributed to relevant documents in the subject like TRS-483 (IAEA) and collaborated with many institutions in several areas of research of radiation application such as DKFZ and HIT (Heidelberg), NPL (London), CNM (Barcelona), IAEA (Vienna), PTB (Braunschweig), CISUP (Pisa), INTA (Madrid). Has been invited professor in Medical Physics at University of Torino (2016) and invited researcher at PTB (Braunschweig) (2022). Participant of the EURAMET projects UHDPulse (2019-2023) and FLASH-Dose (2025-2028). He built the first prototypes of Ultra Thin Ionization Chamber and proposed new methodologies for the evaluation of saturation factors in ionization chamber dosimetry. Member of EFOMP/AAPM TG359 committee for the recommendations on FLASH dosimetry.

Prof. Alexander Gerbershagen (UMCG) has a master’s degree in mathematical physics from University of Cambridge and a doctorate in accelerator physics from the University of Oxford. He has worked at CERN on the beamline design of a future electron-positron collider CLIC and later at PSI on the maintenance and further development of the proton therapy facility PROSCAN. Later, he joined CERN as a staff physicist, being responsible for multiple beamlines for the fixed target experiments, and for projects within the Physics Beyond Colliders program. Following his passion for the medical applications of the accelerators, he contributed to a number of particle therapy projects, such as VHEE-FLASH and GaToroid. Since 2022 he has a faculty position at University Medical Center Groningen (UMCG) in the Netherlands, where he serves as the head of the accelerator facility at the Particle Therapy Research Center.