David Tilman, University of Minnesota (IMAGE) University of Minnesota Caption This image shows Dr. G David Tilman at Cedar Creek Ecosystem Science Reserve. Tilman is director of the University of Minnesota research field station. Credit Jonathan Pavlica Usage Restrictions None 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.