George Westinghouse was the great industrial amplifier of the alternating-current system. In 1888 he bought Tesla's patents, hired engineers, and built the commercial infrastructure that would make AC the global standard. His most visible victory was lighting the 1893 Chicago World's Fair with alternating current, against Edison's DC system. In 1895, the Niagara Falls power station — designed by Tesla and financed by Westinghouse — sealed AC's victory. In the history of electricity, Westinghouse is the paradigmatic case of an industrial amplifier whose systemic contribution exceeds in impact that of many individual inventors, but whose memory was overshadowed by the myth of the lone inventor.