Jianguo Liu, Michigan State University (IMAGE) Michigan State University Caption Jianguo "Jack" Liu, Michigan State University Distinguished Professor, has co-authored a study contending that peer pressure plays a major role in people's environmental behavior. Credit Michigan State University 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.