Frank "Lefty" Rosenthal was an American professional gambler and casino executive, known for his role in the development of the Las Vegas casino industry during the 1970s. He was born on January 12, 1929, in Chicago, Illinois, and became a prominent figure in the world of sports betting and casino management. Rosenthal was associated with several casinos, including the Stardust and Fitzgerald's, where he implemented innovative marketing strategies. Rosenthal's life inspired the character Sam "Ace" Rothstein in the film Casino, directed by Martin Scorsese. He was known for his intelligence and strategic thinking, which helped him navigate the complex world of organized crime and gambling. Despite his success, Rosenthal faced legal challenges and was eventually banned from entering casinos in Nevada.