He is reported to have recited Casey at the Bat to President Grover Cleveland, while presenting a drafted document for approval. Heydler later began working as an umpire in the National League from 1895 to 1897, and then became a sportswriter.
In 1903 he was hired as the private secretary to NL president Harry Pulliam, principally working to compile league playing statistics, a duty of every baseball league office. Heydler's work caused him to record much of the league's early history, and he became an advocate for new ways to measure player accomplishments; for example, he was a strong supporter of recording runs batted in for batters and he began computing earned run averages for pitchers.
On becoming the NL's secretary-treasurer from 1907-1918, he served as the league president briefly after Pulliam's suicide in 1909. As NL president again from 1918 to 1934, he hired the Elias brothers to maintain as official keeper of playing statistics (1919), and he pushed for the selection of Kenesaw Mountain Landis as Commissioner of Baseball (1921), realizing the importance of an official who could keep the owners in check. Later he helped to establish the Baseball Hall of Fame.
In 1929 Heydler proposed permitting a tenth player to bat in place of the pitcher – a rule which came about with the creation of the designated hitter in 1973.
After retiring as league president, he served as NL chairman until his death in San Diego, California in 1956, aged 86.
- Biographical Dictionary of American Sports, Greenwood Press (1987).
- Retrosheet - umpiring record
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