If you’ve ever bought a car with air bags or received a free airline ticket after being bumped from an overbooked flight, you have Ralph Nader to thank for it. Founder of the nonpartisan watchdog group Public Citizen, he has been an advocate for consumers’ rights and safety for more than fifty years.

Nader rose to fame in the 1960s when he took on General Motors over the dangerous design of its rear-engine Corvair car. His 1965 book Unsafe at Any Speed ignited the debate that led to passage of the National Traffic and Motor Vehicle Safety Act a year later. Nader also played a role in the passage of the Freedom of Information Act and the creation of the Environmental Protection Agency. More recently he has fought against unfair trade agreements and corporate welfare and argued in favor of single-payer healthcare. He has run unsuccessfully for president four times, both on the Green Party ticket and as an independent. His recent books include Return to Sender: Unanswered Letters to the President, 2001–2015, Unstoppable: The Emerging Left-Right Alliance to Dismantle the Corporate State, and Breaking through Power: It’s Easier Than We Think. He received the 2016 Gandhi Peace Award, and Life magazine has ranked him as one of the most influential Americans of the twentieth century. His website is nader.org.