Dr Gennser studied medicine at the University of Lund/Malmö, and received his medical degree in 1981. He defended his thesis in physiology at the Karolinska Institutet 1989. He was employed as researcher, senior researcher, and project manager at the Department of Naval Medicine at the Swedish Defence Research Establishment / Swedish Defence Research Agency (FOA/FOI) between 1990 - 2009. Since 2009 he has been researcher at the Department of Environmental Physiology, School of Technology and Health, Royal Institute of Technology, KTH.
Dr Gennser has published scientific papers and reports in various fields related to diving and environmental physiology such as effects of high pressures and the interaction of hydrostatic pressure and inert gases on electrically excitable tissues, hydrogen as dive gas, nitrogen narcosis, psychomotor effects of acute and prolonged hypoxia, survival in cold water and cold protection for divers and submariners, breath hold physiology, submarine escape methods from large depths, and decompression related physiology. Lately, Dr Gennser has been working on trimix tables for the semiclosed mixed gas rebreather used by the Swedish Navy.
