He was educated at Mount St. Joseph's school in Roscrea, County Tipperary.
A former rugby union international he was capped six times for Ireland as a second row forward.
[2] Glennon first held political office when he was elected to Seanad Éireann in a by-election.
[3] Glennon was Vice-chairman of the Oireachtas Committee on Arts, Sport, Tourism, Community, Rural and Gaeltacht Affairs from 2002 to 2007.
In October 2006, Glennon surprisingly announced that he would not be standing at the 2007 general election.