Hayes Dockrell was a prominent water polo player and swimmer with Dublin University Swimming Club and Dublin Swimming Club, gaining 11 caps for Ireland from 1925 to 1933. He was the Irish mile freestyle champion in 1923 and 1924, and in the latter year, at 880 yards. He was only 15 when he won the Liffey Swim in 1922. Having studied medicine at Trinity College Dublin he later took up a post at a hospital in Northampton, and attained the rank of colonel during World War II. He was elected mayor of Northampton in 1967.