As a cameraman and director of productions at Edison's first studio, he was the first to make moving pictures with innovations like continuity, plot, trained actors and special effects.

He was naturalized as a British citizen in 1928 and became a leading member of the Oriental Ceramic Society in London, establishing a valuable collection including rare pieces which had been made for the emperors of the Tang and Song dynasty.

This collapsed in 1894 and Clark then joined Thomas Edison to make early short movies using the Kinetoscope technology at the Black Maria studio.

[4] After the war, he developed the partnership with Eldridge Johnson's Victor Talking Machine Company and acquired the Marconiphone business for its new technologies of radio and electronics, which were now becoming important for home entertainment.

This focussed on cost-cutting and rationalisation to survive the Great Depression but continued to develop its technology, including television which the BBC started broadcasting using an EMI system in 1936.

[2] The rest of the collection was sold or donated by his widow during the 1970s, but is recorded in a catalogue by Edgar Bluett, first published as a series of articles in Apollo magazine.