Caldeira Lab

Min Chen (Visiting Investigator)

David Farnham (Postdoctoral Fellow)

David Farnham is an environmental engineer and hydroclimatologist interested in how climate affects our engineered water and energy systems. David’s work can broadly be described as the development of statistical models to estimate and/or predict climate risks at time scales ranging from daily to seasonal to multi-decadal.

With regard to water systems, David has authored papers on topics ranging from the prediction of urban water contamination, to the estimation of future regional riverine flooding hazard, to the climate drivers of seasonal precipitation variability in water scarce regions such as the Southwestern, United States.

Within energy systems, David has been focusing on weather/climate dependent renewable energy technologies; namely solar, wind, and hydro power. For example, David has recently been investigating the implications of yearly to decadal fluctuations in potential wind and solar energy supply for energy system planning.

Bill Hayes (Programmer)

Bill creates programs to analyze data from climate models for Ken Caldeira and others in his lab.
After receiving his BSEE and MSEE from the University of Cincinnati in his home town he did his first professional work developing hardware and software for a Pediatric Cardiology research lab at Duke University. After working for many small companies in California he became a Systems Engineer at Siemens Oncology in Concord before joining Carnegie
He currently resides in Las Vegas tutoring Python online in his spare time.

Michael Mastrandrea (Director, Near Zero Project)

Michael Mastrandrea is the Director of Near Zero, which provides credible, impartial, and actionable climate and energy research and policy analysis. Previously, he helped lead development of the Intergovernmental Panel on Climate Change Fifth Assessment Report, a global assessment of climate change science and policy options. His work has focused on strategies for reducing climate risks and integrating expert knowledge and quantitative analysis to inform public and private decisions from global to local scales. He has taught at Stanford University as a Lecturer and Assistant Consulting Professor, and received his PhD from Stanford’s Emmett Interdisciplinary Program in Environment and Resources.

Geeta Persad (Research Associate)

Geeta G. Persad is a Research Associate in the Caldeira Lab at the Carnegie Institution for Science's Department of Global Ecology, where she studies the impacts of short-lived climate pollutants on regional and global climate using numerical models. She serves as acting Principle Investigator on Carnegie's multi-year National Science Foundation-funded collaboration with the University of California San Diego and Stanford University to assess the coupled climate and institutional dynamics of short-lived local pollutants and long-lived global greenhouse gases.

Dr. Persad also serves as Senior Climate Scientist in the Union of Concerned Scientists Western States Office where she leads technical analysis on their short-lived climate pollutant and water resources portfolios.

Dr. Persad received her PhD in Atmospheric and Oceanic Sciences and a certificate in Science, Technology and Environmental Policy from Princeton University, where she was a National Science Foundation Graduate Research Fellow and a Ford Policy Fellow. Prior to her PhD, Dr. Persad served as a Physical Scientist in the United States National Oceanic and Atmospheric Administration. She holds a B.S. in Geophysics from Stanford University.

Tyler Ruggles (Postdoctoral Research Scientist)

I am a scientist studying low carbon energy transitions. How do we create a low carbon energy system? What could that system look like? What technological breakthroughs are necessary? These are some of the questions which motivate my research.

My current work focuses on studying the interannual variability of renewable energy resources and potential consequences for a highly-renewable grid. I also model the conversion of electric power to liquid fuels or hydrogen to study the benefits these technologies can bring to the grid including increased flexibility.

Before starting on energy systems research, I completed a PhD in particle physics while based at CERN working for the University of Wisconsin-Madison.

Leslie Willoughby (Science Writer)

Leslie's first love was a horned toad that lived in her backyard in Albuquerque. It disappeared over winter, emerged in spring, and showed her that nature changes over time. Throughout childhood, she yearned to share that lizard's world with others.

In college she studied environmental interpretation. Afterward, at the newly created Ohio EPA, she funded programs that regulated scrubbers in coal-fired power plants and improved sewage treatment facilities. Later, as a science teacher, she set the lab tables with a new narrative each morning. Monday’s tale might compare skeletons; Tuesday’s could mimic a lunar eclipse.

When climate change became the biggest nature story, Leslie signed on as a reporter in the Eastern Sierra. While forest fires rage and drought starves California's snowpack and water supply, Leslie heeds the call for epic writing muscle. She works out every day.