Gerald (Gary) Geernaert is Director, Climate and Environmental Sciences Division, in the Office of Biological and Environmental Research, Office of Science, US Department of Energy. He oversees and directs basic scientific research at DOE National Laboratories and Universities, involving atmospheric, climate, and environmental sciences In addition, he is the federal official responsible for two DOE scientific user facilities, i.e., the Atmospheric Radiation Measurement (ARM) research facility and the Environmental Molecular Science Laboratory (EMSL). Besides his DOE duties, Geernaert serves as Vice-Chair and/or as DOE principal to four science committees under the National Science and Technology Council (NSTC). Dr. Geernaert earned a B.S. degree in Atmospheric Sciences from the University of California, Davis; and he received a PhD degree in Atmospheric Sciences from the University of Washington. Before joining DOE in 2010, Dr. Geernaert spent 8 years as Director, Institute of Geophysics and Planetary Physics, at Los Alamos National Laboratory (LANL); prior to LANL, he spent 8 years as Director, Atmospheric Environment Department, Danish National Environmental Research Institute. Geernaert’s other responsibilities have included national (Danish) representative to the Nordic Council of Ministers Air-Sea Policy Group; President, Danish Atmospheric Research Society; and Program Manager at the US Office of Naval Research. As a practicing scientist, he conducted research at the US Naval Research Laboratory, Scripps Institute of Oceanography, and Danish National Environmental Research Institute. He has written and published 4 technical books and over 100 journal articles and reports throughout his career; and he is a Fellow of the American Meteorological Society.