Herb Stempel was an American television quiz show contestant known for his role in the scandal surrounding the game show Twenty-One in the 1950s. He gained fame for his extensive knowledge and ability to answer difficult questions, which led him to win significant amounts of money on the show. Stempel's success was short-lived, as he later revealed that the show was rigged to favor other contestants, particularly Charles Van Doren. This revelation contributed to a major controversy in the television industry, leading to changes in regulations for quiz shows and impacting public trust in televised competitions.