Upton Sinclair (1878–1968) was an American novelist and social reformer, best known for *The Jungle*, which exposed unsanitary practices in the meatpacking industry. The book led to major food safety reforms in the U.S. He authored nearly 100 works, often addressing corruption and inequality. Sinclair won the Pulitzer Prize for *Dragon's Teeth* in 1943. His writings exemplify Progressive Era activism.