Gael Member of European Parliament (MEP), 1986–89 Joseph Mary Plunkett – rebel; signatory of 1916 Proclamation; executed a month later James McNeill - Governor General of the Irish Free State Legal Arthur Cox – founder of eponymous law firm and member of the Seanad Kevin Dixon - Attorney General of Ireland from 1942 - 1946 William FitzGerald (Irish judge) - former Chief Justice of Ireland Adrian Hardiman – Supreme Court Judge John Hedigan – High Court Judge Michael Joseph Hogan - Chief Justice of the Supreme Court of Hong Kong for 14 years Séamus Woulfe – barrister; Attorney General of Ireland since June 2017 Irish language Tomás de Bhaldraithe – lexicographer Lambert McKenna – lexicographer, editor, educationist, and former principal of Belvedere College Science and academia John Gabriel Byrne - first professor of computer science in Trinity College Dublin Myles Dillon – Celticist, President of the Royal Irish Academy Desmond Fennell - writer, cultural philosopher and linguist Garret A. FitzGerald – Professor of Medicine and Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine, University of Pennsylvania Fergus O'Rourke – zoologist Frank Winder – biochemist, vice-president of the Royal Irish Academy Religion Cardinal Desmond Connell – Archbishop of Dublin and Primate of Ireland Archbishop Dermot Ryan – Archbishop of Dublin and Primate of Ireland Malachi Martin – priest, author Robert Dermot O'Flanagan – Bishop of Juneau Columba Marmion (1858–1923) – Abbot of the Maredsous Abbey (Belgium) Rugby Ollie Campbell – rugby union Andrew Clinch (1867–1937) – rugby union Irish international 10 caps, President of Irish Rugby Football Union Thomas Crean – rugby union and military; and his nephew Cyril Patrick Crean Eugene Davy – rugby union and founder of the Davy Group with his brother James James Downey – rugby union Andrew Dunne – rugby union, cricket James Hart - current Biarritz Olympique rugby player Cian Healy – rugby union David Hawkshaw - rugby union Ian Keatley – rugby union George J Morgan – rugby union Karl Mullen – rugby union Eoin O'Malley – rugby union Sir Tony O'Reilly – rugby union and business as head of Heinz and Independent News and Media and former Chairman of Waterford Wedgwood Hugh O'Sullivan - current Leinster Rugby player David Shanahan - Current Ulster Rugby player Other sports Alec O'Riordan – cricketer Frank Miller - cricketer Cathal Pendred – retired mixed martial artist in the UFC and actor Frank Winder – rock climbing