Conversation so far:
What did Joe McGinnity do later in life?
Joe McGinnity purchased the Newark Indians of the Class-A Eastern League (EL) for $50,000 ($1,394,259 in current dollar terms) in 1909 from Frank J. Farrell.
Did the Newark Indians of the Class-A Eastern League do well?
Joe McGinnity's Newark Indians finished second in the EL in 1909 and 1910.
Did Joe McGinnity own the team the rest of his life?
Joe McGinnity played for and managed the Indians through 1912. He sold his interests in the Indians to Ebbets and Ed McKeever and purchased the Tacoma Tigers.
How did Joe McGinnity's Butte Miners do?
How much did Joe McGinnity buy the Butte Miners for?
Are there any other interesting aspects about the Joe McGinnity's later life besides buying the Newark Indains and Tacoma Tigers?
Joe McGinnity served as player-manager of the Dubuque Climbers of the Class-D Mississippi Valley League during the 1923 season.
Were Joe McGinnity's Dubuque Climbers successful?
With Dubuque, Joe McGinnity won 15 games at age 52. One of those wins was a shutout, pitched in a record one hour and seven minutes.
Did Joe McGinnity do anything else in his later career besides being a player-manager for the Newark Indians, the Tacoma Tigers, the Butte Miners, the Danville Veterans, and the Dubuque Climbers?
Joe McGinnity joined the coaching staff of former teammate Wilbert Robinson, along with Kelley, for the Brooklyn Dodgers during the 1926 MLB season.

Question: What did he do after playing professionally?
Self-contained rewrite: What did Joe McGinnity do after playing professionally?