History of science professor and affiliated professor of Earth and planetary sciences at Harvard University. Her 2004 essay, “The Scientific Consensus on Climate Change,” was widely cited, including by Al Gore in An Inconvenient Truth, and led to congressional testimony in the U.S. Senate Committee on Environment and Public Works. She is co-author with Erik Conway of The Collapse of Western Civilization: A View from the Future and Merchants of Doubt: How a Handful of Scientists Obscured the Truth on Issues from Tobacco Smoke to Global Warming.