Roy Francis McGillicuddy (August 27, 1888 – February 11, 1960), known as Roy Mack; was an American baseball team owner who co-owned the Philadelphia Athletics of the American League with his brother Earle Mack from 1950 through 1954. In 1954, the brothers sold the Athletics to Arnold Johnson, who moved the team to Kansas City, Missouri one season later.
Mack was born in Washington, D.C. in 1888, the son of Hall of Fame manager and former Athletics owner Connie Mack and Gertrude Browning Chaffee. His paternal grandparents, Michael McGillicuddy and Mary McKillop, were born in Ireland. He grew up in Worcester, Massachusetts, where he attended Worcester Academy. He died in Lower Merion Township, Pennsylvania, aged 71.
- U.S., World War II Draft Registration Cards, 1942
- 1870 United States Federal Census
- 1900 United States Federal Census
- Pennsylvania, Death Certificates, 1906-1966
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