Mary Colter (1869–1958) was a pioneering American architect and designer whose work with the Fred Harvey Company left a profound impact on Southwestern architecture. Best known for her designs at the Grand Canyon, she created iconic structures such as Hopi House, Hermit’s Rest, Lookout Studio, and Desert View Watchtower, all carefully integrated with the surrounding landscape and inspired by Native American and Spanish colonial architecture. A trailblazer in using local materials and traditional construction methods, Colter played a key role in shaping the National Park Service Rustic style. As one of the few prominent female architects of her time, her legacy endures in American architectural history.