William O'Brien
William O'Brien (2 October 1852 – 25 February 1928) was an Irish nationalist, journalist, agrarian agitator, social revolutionary, politician, party leader, newspaper publisher, author and Member of Parliament (MP) in the House of Commons of the United Kingdom of Great Britain and Ireland. He was particularly associated with the campaigns for land reform in Ireland during the late 19th and early 20th centuries as well as his conciliatory approach to attaining Irish Home Rule.
Vincent O'Brien (composer)
Among his teaching positions, he taught at the diocesan seminary at Clonliffe College, was Professor of Gregorian Chant at the missionary seminary of All Hallows College (from 1903) and Professor of Music at the Ladies' Teacher-Training College at Carysfort Park, Blackrock (County Dublin), from 1908 to his death in Dublin in 1948. As a much-demanded vocal coach he taught at his home, his best-known pupils including John McCormack, Margaret Burke Sheridan and James Joyce. He performed the piano accompaniments for McCormack's first gramophone recordings and accompanied him during his 1913–4 Australasian tour (60 performances in three months), during which he also gave organ recitals at the Irish-dominated Catholic cathedrals of Sydney and Melbourne.