Paul August Kosok (21 April 1896 – 1959), an American professor in history and government, is credited as the first serious researcher of the Nazca Lines in Peru. His work on the lines started in 1939, when he was doing field study related to the irrigation systems of ancient cultures. By the 1950s, he had completed extensive mapping of more than 300 ancient canals in Peru, in collaboration with archeologist Richard P. Schaedel. Kosok demonstrated the culture's sophisticated management of water to support their settlements.