Moynahan was born in Chicago, Illinois in 1856.\n', '

Moynahan began his career as a professional baseball player in 1879 with the Davenport Brown Stockings of the Northwestern League.\n', '

In August 1880, Moynahan made his major league debut with the Buffalo Bisons of the National League. He appeared in 27 games, all at shortstop for the Bisons, and compiled a .330 batting average.\n', '

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