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|c.1901||Maryland Athletic Club|
|1902||Philadelphia Football Athletics|
|1903||Franklin Athletic Club|
|Career highlights and awards|
H. A. “Bull” Davidson was an early professional American football player for Philadelphia Football Athletics of the 1902 National Football League. He later played in the World Series of Football in 1902 and 1903, held both times at Madison Square Garden in New York City. In 1902, he played for a team simply known as "New York", which comprised ex-players from the recently defunct Philadelphia Football Phillies and Philadelphia Football Athletics of the 1902 National Football League. The following year, he played for the Franklin Athletic Club, which was considered the top team in professional football in 1903 by becoming the unofficial "US Football Champions". Franklin then went on to play in the 1903 World Series of Football, winning the event.
He is also referenced by the Pro Football Researchers Association as Curly Davidson.
- Peterson, Robert W. (1997). Pigskin: The Early Years of Pro Football. Oxford University Press. ISBN 0-19-511913-4.
- Carroll, Bob (1980). "The First Football World Series" (PDF). Coffin Corner. Professional Football Researchers Association. 2 (Annual): 1–8. Archived from the original (PDF) on 2010-12-15.
- PFRA Research. "Franklins Hired Guns: 1903" (PDF). Coffin Corner. Professional Football Researchers Association (Annual): 4–8. Archived from the original (PDF) on 2010-12-15.
- "Penn Football History" (PDF) (Annual). University of Pennsylvania. 2005: 1–16. Archived from the original (PDF) on 2011-07-15.