He became general manager of the St. Louis Browns from 1917 to 1922, developing the perennially poor team into one which lost the 1922 American League pennant by a single game.
To that end, he spent $250,000 on minor league stars[1] However, in a case of exceptionally bad timing, Winslow fell ill in 1924 and largely withdrew from financing the team.
With rosters made up mostly of castoffs from other AL teams, they finished dead last in the American League eight times during Quinn's ten years as owner, only rising as high as sixth twice.
After his 1945 retirement, he briefly served as a sporting goods executive, and then became president of the Baseball Hall of Fame from 1948 to 1951, leaving that position after suffering two strokes.
His son John J. Quinn took over as the general manager of the Braves following his father's retirement, continuing after the team moved to Milwaukee in 1953, and later served as GM of the Philadelphia Phillies.
His great-grandson Bob Quinn (born 1968) is the former executive vice president, finance and administration, and chief financial officer of the Milwaukee Brewers.