Professor Peter Hedström (IMAGE) Linköping University Caption Professor Peter Hedström at the Institute for Analytical Sociology, Linköping University. Credit David Einar Usage Restrictions For editorial use only. Please give credit to photographer David Einar. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.