[1] The following year, he arrived in Australia's Port Phillip District aboard the William Metcalfe on 15 November, along with Miss Maria Elizabeth Barber, formerly of Keyingham near Hull, Yorkshire, whom he married in 1840.

[1] He took up land speculation and became part-owner of the Port Phillip Gazette in the 1840s, and in 1852, purchased the Bourke Street residence of Sir Redmond Barry, the famous Supreme Court Judge and founder of the State Library of Victoria.

[1] Around this time, Elizabeth O'Mullane and her children, including George, were depicted in a family portrait by colonial artist William Strutt, now held at the National Gallery of Victoria.

[4] In 1861, while still a student at Melbourne Grammar School,[5] O'Mullane represented Victoria against H. H. Stephenson's XI, the first English cricket team to tour Australia.

O'Mullane put in a career-best performance behind the wickets[6] and ended on 33 not out in a thrilling partnership with Wills, who scored the first half century in intercolonial cricket (58), leading Victoria to an against-the-odds win.

[6] A left-handed batsman, O'Mullane played without any pretense to style according to cricketer and journalist William Hammersley, but "was a hard, determined hitter ... a very fast run-getter, and fond of taking liberties with the bowling.

[11] This 40-a-side contest, played over three consecutive Saturdays on the Richmond Paddock next to the Melbourne Cricket Ground, ended in a draw with each team scoring one goal.

... Tommy Wills, who was central umpire, decided that past the cricket ground fence was out of bounds, and the goal was disallowed.While O'Mullane represented several football clubs during his career (as was common in those days), including St Kilda and Melbourne, he is most often associated with South Yarra.