Boyle was an officer in the Royal Navy and then had a career in the sugar industry before inheriting his titles in 2003.

In 1976, as a Lieutenant-Commander, he was given the command of HMS Sealion but retired from the Royal Navy in 1979 and went to work in the sugar industry.

Boyle was first styled as Viscount Dungarvan as a courtesy title from 1995 following his father inheriting the earldoms.

[3] Though his Irish titles came from the Peerage of Ireland, which does not make him eligible for election, he also holds the title of Baron Boyle of Marston in the Peerage of Great Britain which allowed him to stand in the by-election for hereditary peers.

In the House of Lords, he is referred to by his higher ranking Irish titles as Earl of Cork and Orrery despite being elected via his barony.