AGU member since 1996. Director, National Center for Atmospheric Research, Boulder, Colo.

Volunteer experience includes Councilor, American Meteorological Society (AMS, 2008-2010);  Member, NRC Committee on the Global Energy and Water Cycle Experiment (GEWEX) (1997-2000); Member, NRC Committee on Climate Data Records from Operational Satellites (2003-2005); Member, NRC Committee on U.S. Climate Change Science Program (2006-2009); Member, NRC Committee on a National Strategy for Advancing Climate Modeling (2011-2013); Co-chair, International CLIVAR Scientific Steering Group (2007-2012); Co-chair, U.S. CLIVAR Scientific Steering Committee (2003-2005; member 1998-2005); Co-chair, U.S. CLIVAR Atlantic Implementation Panel (1999-2003); Member, International GLOBEC Scientific Steering Committee (2005-2010); Member, Climate Working Group, NOAA Science Advisory Board (2013-2016); Member, AGU Revelle Medal Selection Committee (2015-present).