Hennessy was born in Tralee, County Kerry, Ireland. He left school at the age of eleven and a half.[2] His first job was as a messenger boy, and it was then that he discovered that it was important to be able to read. He later worked at building sites in London. He was unable to read or write, but still enjoyed his library of books. [3]

[edit] A renowned songwriter as well as performer, Hennessy wrote several songs that became hits for other singers including ‘Don’t Forget your Shovel’