James Green Douglas, Irish businessman and politician, is born July 11, 1887, at 19 Brighton Square, Dublin. In 1922, he serves as the first-ever Leas-Chathaoirleach (deputy chairperson) of Seanad Éireann, the upper house of the newly independent Irish parliament. He goes on to serve in the Seanad for 30 years.

Douglas is the eldest of nine children of John Douglas, proprietor of John Douglas & Sons Ltd, drapers and outfitters of Wexford Street and originally of Grange, County Tyrone, and his wife, Emily, daughter of John and Mary Mitton of Gortin, Coalisland, County Tyrone. The genealogy of the Douglas family to which he belongs can be traced to Samuel Douglas of Coolhill, Killyman, County Tyrone.

Douglas attends (1895–98) a small school for Quaker children and is a boarder (1898–1902) in the Friends’ School, Lisburn. In 1902, he begins a three-year apprenticeship in his father’s business.

On February 14, 1911, Douglas marries Georgina (Ena) Culley (1883–1959), originally of Tirsogue, Lurgan, County Armagh, whom he meets during his apprenticeship. Their children are John Harold Douglas, who succeeds to the family business and replaces his father as senator, and James Arthur Douglas, who becomes a well-known architect.

From an early age Douglas is fascinated by politics and influenced by the newspapers edited by Arthur Griffith. He becomes a member of the Dublin Liberal Association, whose members for the most part are Protestant home rulers. After the 1916 Easter Rising, with George Russell and others, who also regard themselves as neither unionists nor nationalists, he sets out to promote what they term “full dominion status” for Ireland. This paves the way for the Irish Convention (1917–18), which, however, fails to reconcile the polarised political attitudes of the time.

On February 1, 1921, Douglas, with the help of Sinn Féin, sets up the Irish White Cross. As honorary treasurer and trustee he almost singlehandedly runs the White Cross in 1921. He is appointed by Michael Collins as chairman of the committee to draft the Constitution of the Irish Free State following the Irish War of Independence.

Douglas goes on to become a very active member of Seanad Éireann between 1922 and 1936 under the constitution he had helped to prepare. In 1922, he is elected as the first vice-chairman of the Senate. The Senate is abolished in 1936 and re-established under the terms of the 1937 Constitution of Ireland. He is again an active Senator between 1938 and 1943, and from 1944 to 1954. The topics most associated with him during his work as Senator are international refugees and the League of Nations.

For some thirty years he runs the family business, and is also a director of Aspro (Ireland) Ltd, Nugent & Cooper Ltd, Philips Lamps (Ireland) Ltd, and the Greenmount & Boyne Linen Co. Ltd. In addition, he serves as president of the Linen and Cotton Textile Manufacturers Association and as a member of the council of the Federated Union of Employers.

Douglas dies on September 16, 1954.