Starting at age five, J.R. was groomed to be the heir apparent to his father Jock at Ewing Oil, an independent oil company that Jock ran in a very cutthroat, ruthless manner. After coming home from serving for a short time in the Vietnam War during the 1960s, J.R. began his long tenure as an employee of Ewing Oil. He had no interest in working on Southfork Ranch, which was mostly the domain of his mother Miss Ellie, and brothers Bobby and Ray Krebbs, but he did have a strong desire to keep Southfork in the family. Gary was mostly influenced by his mother and embraced the Southworth tradition of ranching on Southfork and had no interest in Ewing Oil. Like their father Jock, J.R. saw Gary as weak, lacking the Ewing character and growing up Gary was unable to stand up to J.R.'s bullying. A teenage Gary met his wife Valene Clements (Joan Van Ark) in the early 1960s, they married when she became pregnant with their daughter Lucy (Charlene Tilton). J.R. did not approve of Gary marrying someone of Valene's status. When their marriage began to disintegrate, Gary left Southfork leaving Valene and Lucy. When Valene attempted to leave with Lucy, J.R. had her run out of town and took Lucy back to live with the Ewings at Southfork. In 1979, Gary and Valene reunited in Dallas and remarried, but rather than try to live at Southfork again, they left to go and live in the California suburb of "Knots Landing".