Theater mogul Marcus Loew was a prominent figure in the early 20th century entertainment industry. He was the founder of the Loews Theatres chain, which grew to become one of the largest theater chains in the United States. He also founded Metro-Goldwyn-Mayer (MGM), one of the most successful movie studios of all time. Loew was an innovator in the film industry, introducing new technologies and techniques that revolutionized the way movies were made and seen. He was also a philanthropist, donating large sums of money to charities and other causes.