Stack, George Hall (1850–76), rugby player and barrister, was born 2 March 1850, the third son of George Hall Stack, barrister, of Mulloughmore, Omagh, Co. Tyrone, and his wife Mary (née Orpen). His grandfather was the Rev. Thomas Stack of Omagh. He attended Raphoe College, Co. Donegal, and entered TCD (1870), graduating BA (1873) and MA (1875). He was called to the Irish bar in 1876.
A keen member of the Dublin University Football Club, he was one of many Irish rugby players who wished to form a national organisation in order to take part in international competitions. On 7 December 1874 a meeting – attended by players from the TCD team and other clubs such as Wanderers and Lansdowne – was held in Stack's rooms at no. 27 TCD to discuss this proposal. It was resolved to found an organising body, the Irish Football Union, and Stack was appointed to the committee. The first action of the IFU was to organise an international game against England, which was set for Monday 15 February 1875 at the Kennington Oval, London. Ireland was represented by players from the IFU and the Northern Football Union of Ireland (the two unions combined to form the Irish Rugby Football Union in 1880). Stack, playing at half-back, was captain of this first Irish international team, which included a total of nine TCD players, the largest club representation ever on an Irish side. Despite the enthusiasm of the Irish team, England won; the Irish team scored no points. Stack died suddenly 14 November 1876, aged only 26.