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Frank Bunker Gilbreth (July 7, 1868 – June 14, 1924) was an American engineer, consultant and author, known as early advocate of scientific management and a pioneer of time and motion study, and is perhaps best known as the father and central figure of Cheaper by the Dozen.
Both he and his wife Lillian Moller Gilbreth were industrial engineers and efficiency experts who contributed to the study of industrial engineering in fields such as motion study and human factors.

Source: Wikipedia