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.
William L. O'Brien
William L. "Bill" O'Brien (born July 20, 1951) is a lawyer and Republican legislator from Mont Vernon, New Hampshire who has been a member of the New Hampshire House of Representatives since 2004, representing district Hillsborough-4. O'Brien was elected the Speaker of the House on December 1, 2010, when Republicans took control of the House. When Democrats regained control of the House in the 2012 election, O'Brien did not run for a leadership position.