Roy Harry William Johnston (11 November 1929 – 13 December 2019) was an Irish theoretical physicist and republican political activist.
His father was Joseph Johnston, a farmer, economist and historian, a fellow of Trinity College Dublin and a member of the Seanad Éireann on several occasions between 1938 and 1954.
Joe Johnston was a Home Rule supporter who hailed from a small farming Ulster-Scots Presbyterian background in Tyrone.
In 1955 he completed a PhD thesis in cosmic physics, under the supervision of Cormac Ó Ceallaigh at the Dublin Institute for Advanced Studies.
[4] He worked in Aer Lingus as a systems analyst during the 60s and in the 1970s was head of the Applied Research & Consultancy Group in Trinity College Dublin's statistics programme.
The European Court of Human Rights rejected the claim, but ordered that all children are entitled to equal treatment under Irish law, regardless of their parent's marital status.