Senior scientist in the Radioecology Group of the Climate and Monitoring Section of the Department of Environmental Engineering, DTU.  MSc from DTU 1988.  PhD in radioactive contamination from DTU / Risø National Laboratory in 1991.  Post-doctoral fellow at the Department of Geology, University of Reading, UK, 1991.  From 1992 until 2007: senior scientist at Risø National Laboratory (Health Physics Department, Environmental Research Department, Nuclear Safety Research Department), from 2007 until 2012: Risø DTU National Laboratory for Sustainable Energy (Radiation Research Division), 2012 until 2020: DTU Center for Nuclear Technologies, since 2020: DTU Department of Environmental Engineering.  Member of the first Management Board of the European Platform on Preparedness for Nuclear and Radiological Emergency Response and Recovery (NERIS) (2011-2013) and since then member of the NERIS Research & Development Committee.  Leader or participant of numerous international research projects.  Since 2012 he has managed the inter-Nordic collaborative programme on Nuclear and Radiological Emergency Preparedness (NKS-B).  A main supplier of model concepts and parameters integrated in the European standard decision support systems for recovery of radioactively contaminated ecosystems (ARGOS, RODOS).  One of the main authors and data suppliers behind the European handbooks on sustainable restoration and long-term management of contaminated terrestrial areas.  He is a formal expert advisor to the Danish nuclear emergency preparedness.  Research interests encompass e.g. aerosol physics, terrestrial contamination, contamination physics, environmental migration processes and radioecology, emergency preparedness, radiation risk evaluation and mitigation and land restoration.  He has authored or co-authored hundreds of scientific publications.