Robert L. Jacks was a producer and writer known for producing the first four seasons of The Waltons. His film credits include Prince Valiant (1954), Bandito (1956), The Roots of Heaven (1958) and The Undefeated (1969).
| Movie | Man from Del Rio | 1956 |
| Movie | The Day the Loving Stopped | 1981 |
| Movie | The Undefeated | 1969 |
| Movie | Young Love, First Love | 1979 |
| Movie | Do Not Fold, Spindle, or Mutilate | 1971 |
| Movie | A Kiss Before Dying | 1956 |
| Movie | The Proud Ones | 1956 |
| Movie | Bandolero! | 1968 |
| Movie | Man on a Tightrope | 1953 |
| Movie | Gorilla at Large | 1954 |
| Movie | The Homecoming: A Christmas Story | 1971 |
| Movie | Prince Valiant | 1954 |
| Movie | Princess of the Nile | 1954 |
| Movie | Murder Can Hurt You! | 1980 |
| Movie | The Girls of Huntington House | 1973 |
| Movie | A Few Days in Weasel Creek | 1981 |
| Movie | Mr. Horn | 1979 |
| Movie | Man in the Attic | 1953 |