Georgia O'Keeffe's first major job after art school was working as an art teacher in Amarillo, Texas.
After studying in New York, O'Keeffe supported herself through teaching positions. In 1912 she took a summer job teaching art in Amarillo, in the Texas Panhandle, and later returned to Texas for additional teaching work. The broad skies, intense light, and open landscape of the region became important visual experiences during her early career.
Teaching was more than a financial necessity. It gave O'Keeffe time to think about how art could be reduced to essential lines and shapes rather than copied literally. Her experiments with charcoal and abstraction in the mid-1910s eventually brought her work to the attention of Alfred Stieglitz.
Some accounts emphasize her later teaching in South Carolina and West Texas, so Amarillo can be overlooked. The question asks for her occupation, not a later title or a school name: she worked as an art teacher.