Career
Educated at Gresham"s School, Holt from 1945 to 1954, he captained the School"s First XV in 1953-1954. He played 22 internationals for Ireland. His first was against France on 28 January 1956, and his last against South Africa in 1961.
Mulligan was three times captain of Ireland, and he also captained the British & Irish Lions against the New Zealand All Blacks in 1959.
He also played varsity rugby for Cambridge University and was captain of London Irish. In 1964 he wrote the book All Blacks Tour 1963-1964, a complete record of the New Zealand tour to Britain, Ireland, and France.