Karl Michaëlsson is professor of medical epidemiology at Uppsala University and senior consultant in orthopaedic surgery. He is also pro-dean and member of the board at the Disciplinary Domain of Medicine and Pharmacy at Uppsala University with a specific responsibility for research infrastructure and member of the Council for research infrastructure at Uppsala University. Moreover, Karl Michaëlsson is scientific councilor for the National Board of Health and Welfare, member of the board at the Department of Surgical Sciences, Uppsala University and chairman of the research, education and development board, Department of Orthopaedics, Uppsala University hospital. His main research interests are prevention of fractures, osteoporosis, diet, physical activity, and benefits and harms with use of vitamin D, vitamin A, calcium intake, and bone specific drugs. Karl Michaëlsson is also the scientific director for the Central Sweden Cohorts & Biobank, a national research infrastructure funded by the Swedish Research Council.