Robert F. Hill began his screen career in 1915 at Universal Pictures, and in those early days members of film crews were sometimes called upon to do double duty. Young actor Hill showed his talent for writing (as Rock Hawkey) and also directing. He often played cameo roles in films he directed -- not out of vanity, but because he was handy if an actor was suddenly needed, and became an action specialist, working in westerns, outdoor adventures, and serials.
| Movie | The Dangerous Blonde | 1924 |
| Movie | Law and Lead | 1936 |
| Episode |
The Flash Gordon Serials Tree-Men of Mars |
1938 |
| Movie | Two Minutes to Play | 1936 |
| Movie | The Texas Rambler | 1935 |
| Movie | The Feud of the Trail | 1937 |
| Episode |
The Flash Gordon Serials The Prisoner of Mongo |
1938 |
| Movie | Dark Stairways | 1924 |
| Episode |
The Flash Gordon Serials The Black Sapphire of Kalu |
1938 |
| Movie | The Idaho Kid | 1936 |
| Movie | The Roaming Cowboy | 1937 |
| Episode |
The Flash Gordon Serials Symbol of Death |
1938 |
| Movie | Shadow of Chinatown | 1936 |
| Movie | The Breathless Moment | 1924 |
| Movie | East Side Kids | 1940 |
| Episode |
The Flash Gordon Serials New Worlds to Conquer |
1938 |
| Movie | The Vanishing Riders | 1935 |
| Movie | Prison Shadows | 1936 |
| Episode |
The Flash Gordon Serials Incense of Forgetfulness |
1938 |
| Movie | Too Much Beef | 1936 |
| Movie | Cheyenne Rides Again | 1937 |
| Movie | The Painted Trail | 1938 |
| Episode |
The Flash Gordon Serials The Living Dead |
1938 |
| Movie | Jack O'Clubs | 1924 |
| Movie | Crooked Alley | 1923 |
| Movie | Man's Country | 1938 |
| Movie | His Mystery Girl | 1923 |
| Movie | Fighting Fury | 1934 |
| Episode |
The Flash Gordon Serials Human Bait |
1938 |
| Movie | Blake of Scotland Yard | 1937 |
| Movie | Sundown Trail | 1931 |
| Movie | The Crimson Paradise | 1933 |
| Movie | Shadows of the North | 1923 |
| Episode |
The Flash Gordon Serials Queen of Magic |
1938 |
| Movie | The Deputy's Double Cross | 1922 |
| Movie | The Rogues Tavern | 1936 |
| Episode |
The Flash Gordon Serials Ming the Merciless |
1938 |
| Movie | Taming the Wild | 1936 |
| Movie | Men of the Plains | 1936 |
| Movie | Temptation and the Man | 1916 |
| Episode |
The Flash Gordon Serials The Miracle of Magic |
1938 |
| Movie | The Bride's Bereavement; or, The Snake in the Grass | 1932 |
| Movie | The Phantom of the Range | 1936 |
| Episode |
The Flash Gordon Serials Ancient Enemies |
1938 |
| Movie | Danger Trails | 1935 |
| Episode |
The Flash Gordon Serials A Beast at Bay |
1938 |
| Episode |
The Flash Gordon Serials The Boomerang |
1938 |
| Episode |
The Flash Gordon Serials An Eye for an Eye |
1938 |
| Movie | Law and Lead | 1936 |
| Movie | The Stolen Ranch | 1926 |
| Movie | Shadow of Chinatown | 1936 |
| Movie | Blazing Days | 1927 |
| Movie | Too Much Beef | 1936 |
| Movie | Crooked Alley | 1923 |
| Movie | Water, Water, Everywhere | 1920 |
| Movie | Blake of Scotland Yard | 1937 |
| Movie | Sundown Trail | 1931 |
| Movie | Deadly Ray from Mars | 1966 |
| Movie | Danger Trails | 1935 |
| Movie | Sky Racket | 1937 |
| Movie | Law and Lead | 1936 |
| Movie | The Stolen Ranch | 1926 |
| Movie | The Texas Rambler | 1935 |
| Movie | The Feud of the Trail | 1937 |
| Movie | The Idaho Kid | 1936 |
| Movie | Shadow of Chinatown | 1936 |
| Movie | Blazing Days | 1927 |
| Movie | The Vanishing Riders | 1935 |
| Movie | Too Much Beef | 1936 |
| Movie | Cheyenne Rides Again | 1937 |
| Movie | Crooked Alley | 1923 |
| Movie | Man's Country | 1938 |
| Movie | Blake of Scotland Yard | 1937 |
| Movie | Sundown Trail | 1931 |
| Movie | The Crimson Paradise | 1933 |
| Movie | Shadows of the North | 1923 |
| Movie | The Rogues Tavern | 1936 |
| Movie | Taming the Wild | 1936 |
| Movie | Men of the Plains | 1936 |
| Movie | Temptation and the Man | 1916 |
| Movie | The Bride's Bereavement; or, The Snake in the Grass | 1932 |
| Movie | Danger Trails | 1935 |
