Sean P. Keating, an Irish Republican Army (IRA) volunteer who opposes the Anglo-Irish Treaty and later becomes Deputy Mayor of New York City and Regional Director of the United States Postal Service, is born in Kanturk, County Cork, on July 14, 1903.

Raised in Kanturk, Keating is a volunteer in the Irish Republican Army during the Irish War of Independence and fights for the Anti-Treaty Forces against the Irish Free State during the Irish Civil War. He moves to the United States, where he advocates for Irish nationalist causes and for British withdrawal from Northern Ireland. He is involved in Democratic Party politics and a close associate of Irish American political activist Paul O’Dwyer and his brother, New York City Mayor William O’Dwyer. He is involved in the campaigns of President John F. Kennedy and Senator Robert F. Kennedy.

Keating is the youngest of six surviving children of Michael Keating, baker, and his wife Johanna, a native of County Kerry. He was educated at a local school and was an active member of the Gaelic Athletic Association (GAA), playing football and hurling. After the 1916 Easter Rising, he leaves school at the age of thirteen to join the Irish Volunteers, which later becomes the IRA, serving in the 4th Cork Brigade. He is arrested by British troops in November 1920 and badly beaten. He spends a month in the Cork jail and is then interned for a year in Ballykinlar internment camp until December 1921. While interned he participates in several hunger strikes and makes several escape attempts. Following his release, he opposes the Anglo-Irish Treaty and serves in the Fianna Cork 4th Brigade on the Republican side under Seán Moylan during the Irish Civil War.

Keating emigrates to New York City in 1927 and becomes involved in Irish cultural organizations and Democratic party politics. He is a founder of American Friends of Irish Neutrality, which opposes Irish involvement in World War II, ostensibly fearing it will result in British re-occupation of Ireland.

Following World War II, Keating is chairman of the executive council of the 1947 Irish Race Convention and president of the American League for an Undivided Ireland, lobbying in support of the Fogarty Amendment, which unsuccessfully attempts to tie the release of Marshall Plan funds to British withdrawal from Northern Ireland.

Between the 1940s and 1960s, Keating serves as president of the County Corkmen Association, president of the United Irish Counties Association, and president of the Irish Institute. In 1956, he serves as Grand Marshal of the New York City St. Patrick’s Day Parade.

Keating serves in various positions under New York City mayors William O’Dwyer, Vincent R. Impellitteri, and Robert F. Wagner, Jr., rising to the position of Deputy Mayor, under Wagner. He is reportedly the first to publicly introduce future President Kennedy as “the next President of the United States” at an Irish Institute event in 1957. He is appointed Regional Director of the United States Postal Service by President Kennedy and serves in that position from 1961 until his retirement in 1966.

Following President Kennedy’s assassination, Keating serves as National Chairman of the President Kennedy Memorial Committee, which secures the lands and raises the funds for the John F. Kennedy Arboretum in New Ross, County Wexford.

In retirement, Keating returns to Kanturk and continues to advocate for the reunification of Ireland. Keating dies at his home in Kanturk on July 2, 1976, and is buried in a local cemetery with military honors. He represents an emigrant political and social milieu which is often treated dismissively by later, more cosmopolitan Irish commentators, but his career reflects not only his own considerable talents but the ways in which this milieu sustains a generation of immigrants, and the contribution of Irish America to Irish development in the post-war decades.