McGinnity's father, Peter, was born in Dublin, Ireland. His last name was McGinity before he came to United States. He changed it by adding an "n" after he emigrated to the United States in 1861. Peter worked in coal mines and on the farm owned by John and Rebecca Denning, and they accepted him, allowing him to move in with them in their Henry County farm.

McGinnity purchased the Newark Indians of the Class-A Eastern League (EL) for $50,000 ($1,361,852 in current dollar terms) in 1909 from Frank J. Farrell. The press reported that McGinnity would operate the team as a farm team of the Giants, though he denied these reports. When McGinnity could not retain manager Harry Wolverton, he stepped in as player-manager for the Indians. That season, he had a 29-16 record. His 422 innings pitched and 11 shutouts set EL single-season records. He also won both games of doubleheaders on August 27, 1909, and July 23, 1912.  McGinnity played for and managed the Indians through 1912. The Indians finished second in the EL in 1909 and 1910. McGinnity sold his interests in the Indians to Ebbets and Ed McKeever and purchased the Tacoma Tigers of the Class-B Northwestern League for $8,500 ($215,548 in current dollar terms), spending another $50,000 ($1,267,931 in current dollar terms) on the franchise in renovating the stadium. He served as player-manager the Tigers at the start of the 1913 season, but stepped down as manager, hiring Russ Hall to serve as manager in June. McGinnity sold stock in the team in 1915 in order to afford operating expenses. He also briefly played for the Venice Tigers of the Class-A Pacific Coast League in 1914.  McGinnity sold the Tigers and purchased the Butte Miners of the Northwestern League in 1916, serving as player-manager and bringing with him several players from Tacoma. In June 1917, he sold his stock in the team and secured his release. He played for the Great Falls Electrics of the Northwestern League for the remainder of the 1917 season. He later became the manager of the A. E. Staley factory baseball team.  McGinnity served as player-manager of the Danville Veterans of the Class-B Illinois-Indiana-Iowa League in the 1922 season and Dubuque Climbers of the Class-D Mississippi Valley League during the 1923 season. With Dubuque, McGinnity won 15 games at age 52. One of those wins was a shutout, pitched in a record one hour and seven minutes. Two years later, he returned to play for Dubuque and Springfield Senators of the Illinois-Indiana-Iowa League during the 1925 season. He pitched in his final professional game on July 28, 1925, after participating in an old-timers game earlier in the day.  McGinnity joined the coaching staff of former teammate Wilbert Robinson, along with Kelley, for the Brooklyn Dodgers during the 1926 MLB season. McGinnity and Kelley were not retained after the season.

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