Conversation so far:
Where did Joe McGinnity begin as a professional baseball player?
George Pinkney saw McGinnity pitch, and contacted Brooklyn owner Charles Ebbets to recommend he sign McGinnity.
How did Joe McGinnity evolve career-wise ?
Joe McGinnity developed an unorthodox pitching delivery and slow pitching speed.
Where did Joe McGinnity play professional baseball?
Hanlon assigned McGinnity to the Orioles for the 1899 season.
Where else did Joe McGinnity play besides the National League Baltimore Orioles?
He returned to the NL with the New York Giants.

Question: What position did he play?
Self-contained rewrite: What position did Joe McGinnity play?