Maddock was born in Canada, and his family moved to Australia in 1853.

[2] He married Emma Mary Anne Evans in Melbourne in April 1859.

[5] Maddock captained Otago in their match against Southland in January 1864, taking 5 for 16 and 7 for 23 in an innings victory.

[6] A few days later he was a member of the Otago team that defeated Canterbury in the first first-class match in New Zealand.

[9] Later Maddock moved back to Australia and lived in the Sydney suburb of Woollahra, working as an examiner of titles.