Dr. Waleed Abdalati uses satellites and in situ measurements to study polar ice. He takes us on a journey to the polar regions in this video. Waleed is the Executive Director of CIRES of the University of Colorado at Boulder. Waleed was formerly the NASA Chief Scientist (2011-2012) and previously the Head of Cryospheric Sciences at Goddard Space Flight Center (2004-2008). Waleed was heavily involved with the development of the ICESat and ICESat-2 missions.