The Union of Concerned Scientists (UCS) is a nonprofit science advocacy organization based in the United States. The UCS membership includes many private citizens in addition to professional scientists. Anne Kapuscinski, Professor of Environmental Studies and Director of The Coastal Science and Policy Program at the University of California, Santa Cruz, currently chairs the UCS Board of Directors, having replaced James J. McCarthy, Professor of Biological Oceanography at Harvard University and past president of the American Association for the Advancement of Science in 2015.