John T. Mullock (1807–1869), Roman Catholic bishop of St. John's, Newfoundland
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Julia Mullock (born 1928), disputed member of the Korean Imperial Household
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Richard Mullock (1851–1920), Welsh sporting administrator and official
Mullock had future plans to form a Welsh Rugby Union, so selected a team of 'gentlemen players' that represented a wide spread of clubs from around Wales.
It is believed that Summers came to the attention of Mullock as both Cowbridge Grammar and Cheltenham College were on the same fixture list as Cardiff, whose players Mullock was in contact with.
In 1901, he and his family (wife Della Mullock and sons Harvey S. Mudd and Seeley G. Mudd) moved to Los Angeles, California, where he worked as a consulting engineer for the Guggenheim Exploration Company.