The American architect known for popularizing the Prairie School movement is Frank Lloyd Wright. Active in the late 19th and early 20th centuries, Wright's designs emphasized harmony with the surrounding landscape, utilizing natural materials and open floor plans. He believed in creating buildings that complemented their environment, leading to iconic structures like the Robie House and Fallingwater. His innovative approach fundamentally transformed American architecture and inspired future generations. Wright's legacy endures, with a lasting impact on both residential and commercial designs across the globe.