The Executive Committee oversees the activities of the Tyler Prize, including the selection of Tyler Prize Laureates.  Members of this international Committee are selected for their experience in the fields of relevance to the Tyler Prize and are assisted by the Tyler Prize Administrator, based at the University of Southern California.

Julia Marton-Lefèvre is a member of a number of boards focused on environment, development, education and good governance. She chairs the Executive Committee of the Tyler Prize for Environmental Achievement, the Donor Council of the Critical Ecosystem Partnership Fund, the Strategic Advisory Council to the Institute for Sustainable Development and International Relations (IDDRI), and the Board of Trustees of Bioversity International. Other board memberships include the Bureau of the Intergovernmental Panel on Biodiversity and Ecosystem Services (IPBES), the Environmental Leadership Training Initiative of Yale University, the committee of Critical Friends to Veolia, Oxford University’s James Martin School, the Global Institute of Sustainability (Arizona State University), the Prince Albert II of Monaco Foundation, the Turkana Basin Institute, and the Institute of Oceanography of Monaco. Ms. Marton-Lefèvre is a Chevalier de la Légion d’Honneur of France, Chevalier dans l’Ordre de Saint-Charles, Monaco, and  received the Lifetime Achievement Award in 2019 from the National Council of Science and the Environment.  She was the Edward P. Bass Distinguished Visiting Environmental Scholar at Yale University in 2016, and  is a member of the World Academy of Art and Science and the World Future Council.

Rosina M. BierbaumRosina M. Bierbaum received an early introduction to pollution issues, growing up in smoggy Bethlehem, PA. Reading Rachel Carson’s The Sea Around Us at age 11 hooked her on a career to preserve the environment. Dr. Bierbaum is a Professor and Dean Emerita at the University of Michigan with appointments in both the School for Environment and Sustainability, and the School of Public Health. She is also a Professor in the School of Public Policy at the University of Maryland. Her experience extends from climate science into foreign relations and international development. She chairs the Scientific and Advisory Panel of the Global Environment Facility, served on President Obama’s Council of Advisors on Science and Technology, is an Adaptation Fellow at the World Bank, and a lead author of the recently completed U.S. National Climate Assessment. Rosina served for two decades in both the legislative and executive branches of the U.S. Government, including service as the Acting Director of the White House Office of Science and Technology Policy (OSTP). She has lectured on every continent, and in more than 25 countries.

Margaret Catley-CarlsonMargaret Catley-Carlson operates at Board level for improved water resource management and agricultural productivity and rural development. Vice Chair Canadian Water Network Board, member UN Secretary General’s Advisory Board on Water, Rosenberg Forum, Patron/ past Chair Global Water Partnership. Council of Advisors of the World Food Prize, Library of Alexandria in Egypt, Tyler Prize and Stockholm Water Prize, Boards of the International Food Policy Research Institute (IFPRI), International Commission on Integrated Mountain Development (ICIMOD), Syngenta Foundation, and the IFDC (Fertilizer Management). Past positions include: President Canadian International Development Agency 1983-89; Deputy Executive Director UNICEF New York 1981-1983; President Population Council New York 1993-98; Deputy Minister Health and Welfare Canada 1989-92. Ms. Catley-Carlson has ten honorary degrees and is an Officer of the Order of Canada.

Alan CovichAlan Covich is a professor of ecology and former director of the Institute of Ecology in the Odum School of Ecology at the University of Georgia, USA. He chaired Colorado State University’s Department of Fishery and Wildlife Biology and was on the faculty of the University of Oklahoma and Washington University-St Louis. He received a Ph.D. in Biology from Yale University and A.B. degree from Washington University. Covich is a past-president of the International Association of Ecology, the Ecological Society of America, the American Institute of Biological Sciences, and the North American Benthological Society. He received the Icko Iben Award for Excellence by the American Water Resources Association, the Distinguished Service Award by the Ecological Society of America, and was elected a Fellow of the American Association for the Advancement of Science and the Ecological Society of America. His research focuses on impacts of droughts, floods and hurricanes on freshwater ecosystem services and food webs. Covich co-edited three editions of the Ecology and Classification of North American Freshwater Invertebrates, and over 150 published peer-reviewed papers and reviews on climate change and drought impacts on ecosystems for Resources for the Future, and book chapters (Water in Crisis, Encyclopedia of Biodiversity, Encyclopedia of Islands, and the Encyclopedia of Hydrologic Processes).

Exequiel EzcurraExequiel Ezcurra has devoted his career to the study of the dryland ecosystems of northwestern Mexico and other deserts of the Americas. He has published more than 200 papers and books, and developed the script for an award-winning film on the Sea of Cortés. He was honored with a Conservation Biology Award and a Pew Fellowship in Marine Conservation; he was Scientific Chair of the CITES Convention, and President of Mexico’s National Institute of Ecology. Currently, he is the Director of the University of California Institute for Mexico and the United States (UC MEXUS) and Professor of Ecology at the University of California, Riverside.

Kelly Sims GallagherKelly Sims Gallagher is Professor of Energy and Environmental Policy at The Fletcher School, Tufts University. She directs the Center for International Environment and Resource Policy at Fletcher. From June 2014-September 2015 she served in the Obama Administration as a Senior Policy Advisor in the White House Office of Science and Technology Policy, and as Senior China Advisor in the Special Envoy for Climate Change office at the U.S. State Department. Gallagher is a member of the board of the Belfer Center for Science and International Affairs at Harvard University, where she previously directed the Energy Technology Innovation Policy (ETIP) research group. She is also a faculty affiliate with the Harvard University Center for Environment. Broadly, she focuses on energy and climate policy in both the United States and China. She specializes in the role of policy in spurring the development and deployment of cleaner and more efficient energy technologies, domestically and internationally. She speaks Spanish and basic Mandarin Chinese, and is a member of the Council on Foreign Relations. She is the author of China Shifts Gears: Automakers, Oil, Pollution, and Development(The MIT Press 2006), editor of Acting in Time on Energy Policy (Brookings Institution Press 2009), The Global Diffusion of Clean Energy Technologies: Lessons from China (MIT Press 2014), and numerous academic articles and policy reports.

Owen T. LindOwen T. Lind,* Executive Committee charter member, has served both as Secretary and Chair. A limnologist, he studies processes of productivity in sub-tropical and tropical lakes and reservoirs. Professor Emeritus Lind served the Baylor University faculty for fifty years and is presently affiliated with the Center for Reservoir and Aquatic Systems Research and Institute for Ecological, Earth, and Environmental Studies. He was founding director of Baylor’s Institute of Environmental Studies. Lind has been recognized as Baylor University’s Outstanding Scholar, as Distinguished Texas Scientist (Texas Academy of Science), Outstanding Graduate Student Mentor (Conference of Southern Graduate Schools), and for Lifetime Achievement and Contribution to Mexican Limnology (Asociación Mexicana de Limnologia).

Judith E. McDowellJudith E. McDowell is a Scientist Emeritus at the Woods Hole Oceanographic Institution where her research and teaching career in the Biology Department spans four decades. She has been director of Woods Hole Sea Grant since 1993, and in that capacity has supported research and outreach opportunities at colleges, university, and nonprofit organizations throughout the Commonwealth of Massachusetts. Judith received her undergraduate degree in Biology from Stonehill College and her M.S. and Ph.D. degrees in Zoology from the University of New Hampshire. She is also a Pew Fellow in Conservation and the Environment. Her research interests focus on the physiological ecology of marine animals and the effects of chemical contaminants in coastal ecosystems. She has served on numerous national and international committees and working groups on healthy coastal ecosystems and has led several studies for the National Research Council, including Assessing Risks to Endangered and Threatened Species from Pesticides, published in 2013.

Kenneth NealsonKenneth Nealson is the Wrigley Professor of Environmental Sciences at the University of Southern California (USC).  He received his BS and Ph.D. from the University of Chicago, and after a postdoc at Harvard he moved to San Diego (Scripps Institution of Oceanography), where he spent 12 years studying marine microbiology.  He then moved to the Center for Great Lakes Studies in Wisconsin, where he spent 12 years studying freshwater bacteria and geobiological processes in the Great Lakes.   In 1997, he moved to Caltech/JPL, where he established the astrobiology group at JPL, and was the project scientist on the Mars Sample Return Mission.  In 2001, Ken moved to USC, where he now studies geobiology.  Ken has trained more than 30 Ph.D. students, and 30 postdocs, and is actively involved in undergraduate (non-science major) teaching.  He has published more than 400 reviewed papers, and received numerous awards for both research and teaching, including a Guggenheim Fellowship, and Election as a fellow of: American Society for Microbiology, American Association for the Advancement of Science, and the American Geophysical Union.


Jonathan PatzJonathan Patz, MD, MPH, is Professor & John P. Holton Chair in Health and the Environment, and Director of the Global Health Institute at the University of Wisconsin–Madison. Patz served as Health Co-chaired for the first US National Assessment on Climate Change and a lead author for the UN IPCCfor 15 years. From 2006 to 2010, Dr. Patz served as Founding President of the International Association for Ecology and Health. His awards include: Aldo Leopold Leadership Award (2005), IPCC’s Nobel Peace Prize (2007), Millennium Assessment’s Zayed International Prize (2006), UW Romnes Fellow (2009), Fulbright Scholar award (2014) and the American Public Health Association’s Environmental Health Leadership Award (2015). He has published over 90 peer-reviewed research papers and two textbooks on health and global environmental change. Photo credit: Sarah Rose Smiley

* Charter Member