"In the 1920s Elton Mayo, a professor of Industrial Management at Harvard Business School, and his protégé Fritz J. Roethlisberger led a landmark study of worker behavior at Western Electric, the manufacturing arm of AT&T. Unprecedented in scale and scope, the nine-year study took place at the massive Hawthorne Works plant outside of Chicago and generated a mountain of documents, from hourly performance charts to interviews with thousands of employees."