He graduated as a Master of Laws from Yale Law School and as a Doctor of Laws from the Sorbonne University, Paris.  He served as Attorney General of Ireland from 11 November to 15 December 1994. During his tenure as Attorney General former Taoiseach Bertie Ahern described Fitzsimons's relationship with the government and then Taoiseach Albert Reynolds as "strained".  He stood as a Fianna Fáil candidate for the Dublin Clontarf constituency at the 1977 general election but was not elected.
- "The Bar Council Of Ireland". Lawlibrary.ie. Retrieved 28 January 2015.
- "Gallery of previous Attorneys General – 1981 to 1994". Office of the Attorney General. Retrieved 11 January 2012.
- "Bertie Ahern: The Autobiography". Page 164. Retrieved 19 January 2015.
- "Eoghan Fitzsimons". ElectionsIreland.org. Retrieved 11 January 2012.
|Attorney General of Ireland