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.  Nominated for Cinematography (Black and White) 1942: MOONTIDE  Nominated for Cinematography (Color) 1943: HELLO, FRISCO, HELLO (w. Allan Davey)  Scientific or Technical Awards (Class III) 1943: For the development and practical application of a device for composing artificial clouds into motion picture scenes during production photography.  Nominated for Cinematography (Color) 1948: GREEN GRASS OF WYOMING  Nominated for Cinematography (Color) 1949: SAND  Honorary and Other Awards 1979: "Presented in appreciation for outstanding service and dedication in upholding the high standards of the Academy of Motion Picture Arts and Sciences." Winners presented Medals of Commendation. (w. John O. Aalberg & Dr. John G. Frayne) 4 nominations, 1 Honorary Award, 1 Scientific/Techical Award