Began his career as a portrait photographer in 1912. Clarke designed a battery-run camera motor which became the industry standard during the silent era, was a pioneer of matte photography techniques, and developed a reputation for location work under difficult conditions. He was nominated four times for an Academy Award.
Cinematography (Feature Film)
First made lab assistant
First film as co-director of photography (also editor), "The Half Breed"
Directed short film "Pigskin Heroes"
Co-shot (with John Boyle) Oscar ceremonies