L. Ruby Leung is a Battelle Fellow at Pacific Northwest National Laboratory and the Chief Scientist of the U.S. Department of Energy’s Energy Exascale Earth System Model (E3SM), a major effort involving climate and computational scientists and applied mathematicians to develop state-of-the-art capabilities for modelling human-Earth system processes on Department of Energy’s next generation high-performance computers. She is an elected member of the U.S. National Academy of Engineering and Her research broadly cuts across multiple areas in modeling and analysis of climate and water cycle including orographic precipitation, monsoon climate, extreme events, land surface processes, land-atmosphere interactions, and aerosol-cloud interactions. She has published over 500 papers in peer-reviewed journals.