John Hays Hammond, Jr. was one of the most prolific inventors in U.S. history, and registered over 500 patents throughout his career. Known as "the father of radio control," Hammond was a pioneer in many technologies, including television and sound recording. He counted among his friends and mentors Thomas Edison, Nikola Tesla, and Alexander Graham Bell. He was also a collector of ancient, medieval, and Renaissance artifacts, and built his castle-like home in Gloucester, Massachusetts in the late 1920s.

John Leysath is the curatorial director at Hammond Castle Museum, a position he has held since 2021. He specializes in exploring the history of Hammond's scientific career, and communicating the importance of his groundbreaking work to the Museum's many visitors. He is also responsible for the Museum's exhibits and digital media.

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