Catherine McGuinness (née Ellis), retired Irish judge, is born in Belfast, Northern Ireland on November 14, 1934. She serves as a Judge of the Supreme Court of Ireland from 2000 to 2006, a Judge of the High Court from 1996 to 2000, a Judge of the Circuit Court from 1994 to 1996 and a Senator for the University of Dublin from 1979 to 1981 and between 1983 and 1987. She is appointed by President Michael D. Higgins to the Council of State from 1988 to 1990 and 2012 to 2019.

McGuinness is President of the Law Reform Commission from 2007 to 2009. In May 2013, she is appointed Chair of the National University of Ireland Galway Governing Authority.

McGuinness is educated in Alexandra College, Trinity College Dublin and the King’s Inns. In the 1960s she works for the Labour Party. She is called to the Irish Bar in 1977 at age 42. In 1989, she is called to the Inner Bar.

In 1979, McGuinness is elected as an independent candidate to Seanad Éireann at a by-election on December 11, 1979 as a Senator for the University of Dublin constituency, following the resignation of Senator Conor Cruise O’Brien, taking her seat in the 14th Seanad. She is re-elected at the 1981 elections to the 15th Seanad, and in 1983 to the 17th Seanad, where she serves until 1987, losing her seat to David Norris. She is appointed to the Council of State on May 2, 1988 by President Patrick Hillery and serves until 1990.

McGuinness is appointed a judge of the Circuit Court in 1994, the first woman to hold that office in Ireland. In 1996, she is appointed to the High Court and remains there until her appointment to the Supreme Court in January 2000.

In November 2005, McGuinness is appointed Adjunct Professor at the Faculty of Law, National University of Ireland, Galway. She is also appointed President of the Law Reform Commission in 2005, and holds that position until 2011.

In April 2009, McGuinness is awarded a “Lord Mayor’s Award” by Lord Mayor of Dublin Eibhlin Byrne “for her contribution to the lives of children and families in the city through her pioneering work.” In September 2010, she is named as one of the “People of the Year” for “her pioneering, courageous and long-standing service to Irish society.” In November 2012, she wins the Irish Tatler Hall of Fame Award.

In addition to her judicial career, McGuinness serves on the Employment Equality Agency, Kilkenny Incest Investigation, the Forum for Peace and Reconciliation, the National Council of the Forum on End of Life in Ireland and the Irish Universities Quality Board. In June 2011, she becomes patron of the Irish Refugee Council. In November 2011, she is appointed Chairperson of the “Campaign for Children.”

McGuinness has received honorary doctorates from the University of Ulster, the National University of Ireland, the University of Dublin, the Higher Education and Training Awards Council (HETAC) and the Royal College of Surgeons in Ireland. In February 2013, she accepts the Honorary Presidency of Trinity College, Dublin’s Free Legal Advice Centre.

In January 2014, McGuinness is appointed by Minister for Communications, Energy and Natural Resources, Pat Rabbitte, to chair the expert panel to oversee the preparation of reports on the best underground route options to compare with the Grid Link and Grid West high voltage power lines in Ireland. In March 2015, McGuinness receives an Alumni Award from Trinity College Dublin.

McGuinness is married to broadcaster and writer Proinsias Mac Aonghusa from 1954 until his death in 2003 and has three children. She resides in Blackrock, Dublin.