Human relations By davidsoria15 Sep 7, 1771 Robert Owen Sep 7, 1835 The philosophy of manufacturers Sep 7, 1841 Henri Fayol Sep 7, 1856 Frederick Taylor Sep 7, 1864 Max Weber Sep 7, 1868 Mary Parker Follett Sep 7, 1868 Frank Gilbreth Sep 7, 1869 Knights of labor Sep 7, 1880 Elton Mayo Period: Sep 7, 1924 to Sep 7, 1932 Hawthorne studies Sep 7, 1935 Wagner Act Sep 7, 1940 Group dynamics Sep 7, 1951 Carl Rogers Sep 7, 1960 Douglas McGregor Sep 7, 1961 Eric Berne Sep 7, 1961 Theory X and Theory Y Sep 7, 1961 Transactional Analysis