Geir Johnsen is a professor in marine biology at Centre for Autonomous Operations and Systems (AMOS) at Dept of biology Norwegian University of Technology and Science (NTNU), Prof II at University Centre on Svalbard (UNIS), and is one of the founding partners in a NTNU spin-off company Ecotone using new optical techniques for mapping and monitoring the marine environment. He has been at 1 year research stays at University of California at Santa Barbara (1992-93) and at Curtin University, Perth, Australia (2010-11). Adviser for 47 MSc and 15 PhD students graduated. Currently he advises 1 MSc and 5 PhD students and 2 post docs. Published >120 papers in international scientific journals and been a co-editor for the books "Ecosystem Barents Sea" and "Phytoplankton pigment",Cambridge Uni Press.