Frank Lloyd Wright was an American architect, interior designer, writer, and educator, whose creative period spanned more than 70 years, designing more than 1,000 structures, of which 532 were completed. Wright believed in designing structures that were in harmony with humanity and its environment, a philosophy he called organic architecture. This philosophy was best exemplified by "Fallingwater" (1935). As a founder of organic architecture, Wright played a key role in the architectural movements of the twentieth century, influencing three generations of architects worldwide through his works. Wright designed houses, offices, churches, schools, skyscrapers, hotels, museums, and other structures.