Chris Horner (full name Christopher Horner) is an American attorney, author, and prominent climate change skeptic who serves as a senior legal fellow at the Competitive Enterprise Institute (CEI), a libertarian think tank in Washington, D.C. He is known for his aggressive use of Freedom of Information Act (FOIA) requests and litigation against federal agencies such as NASA and the National Oceanic and Atmospheric Administration (NOAA), as well as individual climate scientists, accusing them of withholding data and manipulating evidence to support global warming narratives. His legal actions have contributed to lawsuits that have delayed or influenced climate policy implementations, positioning him as a key figure in networks challenging mainstream climate science, often aligning with conservative and industry interests. Horner is a prolific author with books critiquing environmental alarmism and government overreach, including 'The Politically Incorrect Guide to Global Warming and the Environment' (2007) and 'Red Hot Lies: How Global Warming Alarmists Are Destroying Our Economy, Our Liberty, and Our Real Environment' (2008). He has testified before Congress, appeared on media outlets like Fox News, and contributed to reports questioning climate data integrity. Beyond climate issues, he has advocated for tobacco industry deregulation and broader transparency reforms, authoring 'The Liberal War on Transparency' (2018). His work has drawn significant controversy, with critics accusing him of cherry-picking data and promoting denialism funded by fossil fuel interests, though Horner maintains his actions promote scientific accountability. His legal strategies have resulted in notable outcomes such as a 2015 settlement with NOAA over data access.