Håkan Nyström obtained his MSc at the University of Umeå, Sweden, followed by a PhD in Medical Physics in 1993. He worked as a medical physicist there until 1997 when he moved to Copenhagen, Denmark, and worked for 10 years as chief physicist at the radiotherapy clinic. His main research interest was in clinical implementation of new treatment technologies such as IMRT and breathing adapted radiotherapy. He was appointed Associate Professor at the Niels Bohr Institute, University of Copenhagen 2006 – 2011. In 2007 he became the project leader of the Swedish proton therapy project where he subsequently worked as chief physicist and from 2015 when the proton clinic opened for patient treatments as head of the proton clinic. In 2017 he joined the Danish Particle Therapy Centre (DCPT) in Aarhus, Denmark as a senior medical physicist and in 2020 he worked as the medical physics team leader at the proton center in Groningen, The Netherlands. Presently Håkan Nyström is sharing his time with the Skandion Clinic in Uppsala, Sweden and in assisting other proton projects internationally. He is a co-chairman for WP5 of the European Network for Particle Therapy (EPTN), a Task Force within ESTRO and is a member of the steering committee of the PTCOG and its educational committee.