Vint became an associate landscape engineer in 1926, and the following year he was promoted to the position of chief landscape architect for the Yosemite project, outranking Hull. In 1933 Vint moved to Washington to become the chief of the Park Service Branch of Plans and Designs, a position that was enormously influential in the planning, construction and conservation of the national parks. Vint was particularly active in the formulation and administration of design standards associated with the Park Service's Mission 66 program. He continued to be the foremost authority on architecture and landscape architecture for the National Park Service until retiring in the 1960s.