Herrmann was born in Cincinnati, Ohio on May 3, 1859 to a family of German descent. He served as president of the Cincinnati Reds of the National League from 1902 to 1927. He served as the president of National Baseball Commission from 1903 to 1920.
He filled the role of Baseball Commissioner before that position was officially established in 1920. With two other Commission members he established the annual nature of the World Series by 1905. According to biographer William A. Cook's August "Garry" Herrmann: A Baseball Biography, although Herrmann was financially successful, he had a reputation as a lavish entertainer, supported by news that he left an estate of ten dollars. He died on April 25, 1931, eight days before his 72nd birthday.
On July 19, 2008, Herrmann was posthumously inducted into the Cincinnati Reds Hall of Fame.
-  "German Cincinnati by Don Heinrich Tolzmann: German American assistants Rudolph Hynicka and August Hermann"
-  "Young August, a good Cincinnati German, worked for another good Cincinnati German..."
- "August Herrmann Resigns As Chairman Of The National Baseball Commission. Herrmann Resigns His Chairmanship Head Of Baseball's Supreme Court. Wants Action Taken As Soon As Possible. Surprises His Associates. Annual Report To Johnson And Heydler Had Led Them To Expect He Would Defer Decision. Surprise To His Associates. Advocates Deferred Election". The New York Times. January 9, 1920. Retrieved 2010-02-13.
August Herrmann, for more than sixteen years Chairman of the National Baseball Commission, has resigned. His resignation, which was presented at the annual meeting of the commission here today, is to take effect at the earliest possible date, not later than the joint meeting of the National and American Leagues, called for Feb. 11 in Chicago.
- "Death: April 25, 1931, Cincinnati, OH"