Final answer:
Frank Lloyd Wright was a highly influential American architect known for his philosophy of organic architecture and his famous designs such as Falling water. He played a key role in the Prairie School movement and created a unique American architectural style.
Step-by-step explanation:
Frank Lloyd Wright, one of America's most significant architects, was known for his philosophy of organic architecture, which emphasized the harmonious integration of buildings with their natural surroundings and the needs of the occupants. He designed over 1,000 buildings, including the famous Falling water house, which is considered a masterpiece of American architecture. Wright's Prairie School movement, inspired by the Arts and Crafts Movement, focused on creating a unique American architectural style that blended with the Midwestern landscape.