WCS (Wildlife Conservation Society) was founded in 1895 as the New York Zoological Society (NYZS) and currently works to conserve more than two million square miles of wild places around the world. The organization is led by President and CEO Cristián Samper, former Director of the Smithsonian Institution's National Museum of Natural History. Based at the Bronx Zoo, WCS maintains approximately 500 field conservation projects in 65 countries, with 200 PhD scientists on staff. It manages four New York City wildlife parks in addition to the Bronx Zoo: the Central Park Zoo, New York Aquarium, Prospect Park Zoo and Queens Zoo. Together these parks receive 4 million visitors per year. All of the New York City facilities are accredited by the Association of Zoos and Aquariums (AZA).