AGU member since 1976. Distinguished professor, Departments of Civil and Environmental Engineering and Earth System Science, and director, Center for Hydrometeorology and Remote Sensing (CHRS), University of California, Irvine. Volunteer experience includes past president, AGU Hydrology section; past editor, AGU Water Resources Research; past chair, Scientific Steering Group (SSG), Global Energy and Water Cycle Experiment (GEWEX) of the World Climate Research Programme (WCRP); member, Joint Scientific Committee (JSC) of WCRP; past member, University Corporation for Atmospheric Research (UCAR) Board of Trustees; emeritus member, National Oceanic and Atmospheric Administration (NOAA) Science Advisory Board; service on numerous advisory committees, including those of National Research Council, NASA, NOAA, National Science Foundation, Environmental Protection Agency, and UNESCO.