League Presidents

American League        Term       Number of Seasons
Ban Johnson            1901-1927        27
Ernest S. Barnard      1927-1931         5
William Harridge       1931-1959        29 
Joe Cronin             1959-1973        14
Lee McPhail            1974-1983        10
Bobby Brown            1984-1994        11
Gene Budig             1995-present

National League        Tenure     Number of Seasons
Morgan G. Bulkeley     1876             1
William A. Hulbart     1877-1882        6
A.G. Mills             1883-1884        2
Nicholas Young         1885-1902       18 
Henry Pulliam          1903-1909        7
Thomas J. Lynch        1910-1913        4
John K. Tener          1914-1918        5
John A. Heydler        1918-1934       17
Ford Frick             1935-1951       17
Warren Giles           1951-1969       19
Charles Feeney         1970-1986       17
A. Bartlett Giamatti   1987-1989        3
Bill White             1989-1994        6
Leonard Coleman        1995-present