William DeWolf Hopper was an American actor, singer, comedian, and theatrical producer during the late-19th and into the early-20th centuries. Born in New York Citty, DeWolf Hopper grew to become a star of vaudeville and musical theater, but he became best known for performing the popular baseball poem “Casey at the Bat.”

A lifelong baseball enthusiast and New York Giants fan, Hopper first performed Ernest Lawrence Thayer’s then-unknown poem “Casey at the Bat” to the Giants and Chicago Cubs on August 14, 1888. Co-performer Digby Bell called Hopper “the biggest baseball crank that ever lived. Physically, of course, he is a corker, but when I say big I mean big morally and intellectually. Why, he goes up to the baseball [Polo] grounds at One Hundred and Fifty-fifth street after the matinees on Saturday, and he travels this six miles simply to see, perhaps, the two final innings, and any one can imagine the rapidity with which he must scrape off the makeup and get into his street clothes in order to secure even this much. But he says the Garrison finishes are worth it, and he is perfectly right. Hopper always was a baseball crank, long before the public knew anything about it.”

Hopper helped make Thayer’s poem famous and was often called upon to give his colorful, melodramatic recitation, which he did about 10,000 times over the course of his career.