For over 25 years, Stephen Klein has been an atmospheric research scientist. Since 2004, he has been at the Department of Energy’s Lawrence Livermore National Laboratory, where he is a member of the Cloud Processes Research and Modeling Group under the Atmospheric, Earth and Energy Division of the Physical Life Sciences Directorate. Prior to 2004, he was a research scientist at two leading climate and weather modeling laboratories: the National Oceanic and Atmospheric Administration’s Geophysical Fluid Dynamics Laboratory and the European Centre for Medium Range Weather Forecasts.
An atmospheric research scientist for more than 25 years, Klein is a member of LLNL’s Cloud Processes Research and Modeling Group under the Atmospheric, Earth and Energy Division of the Physical Life Sciences Directorate. Before joining LLNL in 2004, he was a research scientist at the National Oceanic and Atmospheric Administration’s Geophysical Fluid Dynamics Laboratory and the European Centre for Medium Range Weather Forecasts.
Klein joined AMS as a student in the early 1990s and later served as an editor for AMS’s Journal of Climate. With more than 130 peer-reviewed papers and awards from the U.S. Department of Energy, American Geophysical Union, and LLNL to his credit, Klein today focuses his research on clouds, the role of clouds in climate change, and the representation of clouds in numerical models of the atmosphere.

Research Interests
Clouds
The role of clouds in climate change
The representation of clouds in numerical models of the atmosphere
Honors and Awards
2020, Fellow of the American Meteorological Society
2013, LLNL’s Physical and Life Sciences Directorate Award as an Outstanding Postdoc Mentor in recognition of exemplary mentoring, coaching, leadership, as well as scientific contributions to the community of climate and atmospheric researchers at LLNL.
2012, American Geophysical Union “Ascent” Award for mid-career scientists in the fields of the atmospheric and climate sciences who have demonstrated excellence in research and leadership in their field.
2009, U.S. Department of Energy’s Appreciation Award in recognition of contributions as the leader of the Cloud Modeling Working Group of the Atmospheric Radiation Measurement Program.