 He is a past president of the International Glaciological Society, chairs the West Antarctic Ice Sheet Initiative, is an editor for the Journal of Glaciology and has led 14 expeditions to Antarctica and has participated in numerous other expeditions around the world including Greenland.He has also testified before Congress and has briefed the U.S. vice president concerning ice-sheet stability and is often quoted or featured in the media.He was born in Pittsburgh and received a B.S.