On September 12, 2001, the Chicago Gaelic community suffered a great loss. Eoin had a massive heart attack at work and was called to his heavenly reward. Eoin McCullogh was born in Brooklyn, New York on January 9, 1937, the son of Agnes and John McCullough. His grandparents came from Gortin, Co. Tyrone. His grandfather was a Gaelic speaker.

Eoin graduated from St. Augustine High School graduating in 1955 and then attended the University of Notre Dame. He served in the U.S. Navy and was aboard one of the first five ships called out in the Cuban Missile Crisis. When he was in high school, he had to learn Latin and French as part of the school curriculum. He decided to learn Gaelic for himself. So, in 1952, he joined Cumann Brendahn (St. Brendan Gaelic Society) in Brooklyn. they held Gaelic classes on Friday nights followed by ceili dancing. He became fluent in Gaelic and adept at ceili dancing. This is where he me his future wife, Carol Ann.

Eoin and his family moved to the Chicago area in 1967. He joined the Chicago Irish Musicians in 1968. In 1971, Eoin and Fr. Patrick Brankin started teaching Gaelic and ceili dancing once a week, with ceili dances held once a month with the music provided by the Irish Musicians. He later joined the Francis O'Neill Branch of CCÉ and was the Language Officer. He also served as Language Officer for the Midwest Region for several years.

As a founding member of Na Gaeil Gaelic Society, he taught Gaelic on Wednesday nights and Saturday mornings at the Irish American heritage Center in Chicago. he was very devoted to all Irish culture. He loved the hisotry, language, and music of Ireland.

He was planning to retire from his job with the government in 2002 and oped to spend six weeks immersed in Gaelic in the Gaeltacht. If there was a ceili, or a Gaelic weekend, you would likely find him there. He taught Gaelic classes in Milwaukee, St. Paul, Pittsburgh, and New York for their respective Gaelic weekends. At the time of his death, he was preparing a Gaelic course for little children to be taught at the Heritage Center of Chicago on Saturday mornings.