Denis Felikson, NASA research scientist (IMAGE) University of Texas at Austin Caption The study's lead author Denis Felikson, now a research scientist at USRA and NASA, on a field visit to Root Glacier in Alaska when he was a doctoral student at UT's Jackson School. Credit Denis Felikson. 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.