Öster is Director of CSC Advanced Computing Facility which hosts, operates, support, and develops the Finnish national computing infrastructure, the EuroHPC supercomputer LUMI and the LUMI AI Factory Services. Öster represents CSC in a several international initiatives and organisations: EOSC Association; the European Collaborative Data Infrastructure EUDAT; the board of ELIXIR, the European bio-informatics infrastructure; and Knowledge Exchange, a partnership to promote open scholarship and improve services for higher education and research in Europe.

Per Öster has more than 30 years of experience in computational science from both academia and industry. He has a doctorate in physics from the Department of Physics, University of Gothenburg/Chalmers University of Technology.