Redmond is one of four children born to cabinet-maker Thomas and Eileen Redmond. Educated at the Christian Brothers schools in Dublin, he later attends University College Dublin and initially reads medicine before moving into drama.
While Director of the Dramatic Society Redmond meets and marries the society’s secretary, Barbara MacDonagh, sister of Donagh MacDonagh and daughter of 1916 Easter Rising leader Thomas MacDonagh and Muriel Gifford. They have four children.
Redmond is invited to join the Abbey Theatre in 1935 as a producer by William Butler Yeats, the Irish poet. Yeats writes his play Death of Cú Chulainn for Redmond to star as Cú Chulainn, hero of one of Ireland’s foundational myths.
Redmond makes his acting debut at the Abbey Theatre in 1935 in Seán O’Casey‘s The Silver Tassie. His first stage appearance is in 1939 in New York City in The White Steed. After returning to Britain at the outbreak of World War II he is a regular on the London stage. He is one of the founders of the Writers’, Artists’, Actors’ and Musicians’ Association (WAAMA), a precursor of the Irish Actors’ Equity Association. His insistence that “part-time professionals” – usually civil servants who act on the side – should be paid a higher rate than professional actors for both rehearsal time and performance, effectively wiping out this class, raising the wages and fees of working actors.
Redmond stars in Broadway, among other plays starring in Paul Vincent Carroll‘s The White Steed in 1939, playing Canon McCooey in The Wayward Saint in 1955, winning the George Jean Nathan Award for Dramatic Criticism for his performance, and starring in 1968 in Joe Orton‘s Loot and Brian Friel‘s The Loves of Cass Maguire.
Redmond works in television and film throughout the 1950s to the 1980s and is regularly seen in television series such as The Avengers, Daniel Boone, The Saint and Z-Cars. He is often called upon as a character actor in various military, religious and judicial roles in films such as I See a Dark Stranger (1946), Captain Boycott (1947), High Treason (1951), The Cruel Sea (1953), The Playboy of the Western World (1962), Kid Galahad (1962), The Luck of Ginger Coffey (1964), Tobruk (1967), The Ghost and Mr. Chicken (1966) and Barry Lyndon (1975). His performance as the kindly occult expert in the cult horror film Night of the Demon (1957) is a favourite of fans of the film.
Redmond retires to Dublin and dies at age 76, after a long period of ill health, on October 28, 1989. His wife Barbara predeceases him in 1987.