He suffered a serious accident in 1910 when he was injured by an explosion in an acetylene torch which he was using at his home.
He was also injured in another accident at home while using explosives to remove a tree trunk in the grounds of his house.
During the 1916 Easter Rising, Leonard, travelling with his son Mark, was told to stop at a road-block by rebels.
After independence, Leonard was elected to Dáil Éireann as a Cumann na nGaedheal Teachta Dála (TD) for the Dublin North constituency at the Dublin North by-election on 11 March 1925 caused by the resignation of Francis Cahill of Cumann na nGaedheal.
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