Robert Socolow, Princeton University (IMAGE) Princeton University, Engineering School Caption Robert Socolow of Princeton University is a member of a National Academy of Engineering panel that has identified the greatest technological challenges of the 21st century. Credit Photo by Denise Applewhite, Princeton 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.