This article argues that Thomas Edison and George Westinghouse, despite some shared characteristics in their approach to technical problems and a common interest in electric power, pursued distinct markets for innovation. Edison sold novelties to upper-class urbanites, whereas Westinghouse provided equipment to railroads and other industrial customers. As a consequence, the two entrepreneurs consistently exhibited different attitudes toward the process of innovation and different inclinations as businessmen. Westinghouse, more than Edison, foreshadowed the coming of corporate research and development.