He was known for his energy and zeal, as well as his overt activism in local politics, founding the 'Belfast Catholic Association'.

[1] After his education at St Patrick's College, Maynooth, he was ordained for the Diocese of Down and Connor on 7 June 1870 by Matthew Quinn, the Bishop of Bathurst.

"[3] Dr Henry believed that a religious order of priests could give invaluable help in the densely populated area of West Belfast.

In 1900, he helped establish St. Mary's Training College to staff local Catholic schools.

[8] Henry's episcopal ministry took place against the intensely fought political battles around Irish Home Rule and he worked hard to influence - some might say shape directly - nationalist political opinion, and representation in Belfast, at the heart of his diocese.