Hogan joins the Society of Jesus and studies for the priesthood in Belgium and France. He returns to Ireland where he teaches German for a year at Clongowes Wood College and then languages and music in the Sacred Heart College, Limerick.
After extensive research in Rome Hogan publishes a history of the Jesuits in Ireland and a life of Saint Patrick. He lectures on Irish language and history at University College Dublin and is Todd Professor (Celtic) at the Royal Irish Academy.
Hogan’s works include Distinguished Irishmen of the 16th Century (1894), the Irish Phrase Book (1899) and Onomasticon Goedelicum: An Index to Irish Names of Places and Tribes (1910), a standard reference based on the research of John O’Donovan, The Irish Wolfhound, A Description of Ireland in 1598 and Chronological list of the Irish members of the Society of Jesus, 1550-1814. He also contributes to the editing and compilation of other works in his field.
Edmund Ignatius Hogan dies on November 26, 1917.