Frederick Law Olmsted (1822-1903), an American landscape architect and urban planner, left an indelible mark despite lacking specific training. He founded a studio in 1857 with C. Vaux, undertaking iconic projects such as Central Park and Prospect Park, and contributed to the Chicago World's Columbian Exposition in 1893. He was a pioneer in advocating for national parks and environmental conservation, also overseeing the preservation of Niagara Falls.