In 1955, Audrey Wadowska, the daughter of Cooper, attended an exhibition on film history in London, where she saw stills from a series of films credited to Brighton-based film pioneer George Albert Smith, which she claimed contained members of her family and must therefore have been filmed by her father. The series is known as the GRG-Series, after "Grandma's Reading Glass" (1900); the significance of this particular film is its pioneering use of interpolated close-up. Wadowska's campaigning, championed by Dutch researcher Tjitte de Vries, has resulted in the films being re-attributed to Cooper by New York's Museum of Modern Art Film Archive, but other archives, including the BFI National Film and Television Archive, have not done the same.