Ralph Nader is a well-known American political activist, author, lecturer, and attorney who ran for president of the United States as an independent candidate in 1996, 2000, and 2004. He is also the founder of numerous public interest groups, including Public Citizen, the Center for Auto Safety, and the National Taxpayers Union. Nader is a strong advocate for consumer protection, environmentalism, and government reform. He has been a vocal critic of corporate power and influence in politics, and has been a major force in the development of the modern progressive movement.