Frederick Law Olmstead was the leading landscape architect of the post-Civil War generation, and has long been acknowledged as the founder of American landscape architecture (he designed Central Park in New York City). The last great project that Olmsted was involved with was the 120,000 acre Biltmore Estate.Frederick Law Olmstead was the leading landscape architect of the post-Civil War generation, and has long been acknowledged as the founder of American landscape architecture (he designed Central Park in New York City). The last great project that Olmsted was involved with was the 120,000 acre Biltmore Estate.