Sonntag, 22. Juni 1952
Dennis Michael O'Brien (born 1952) is an American Republican Party politician who served as the 137th Speaker of the Pennsylvania House of Representatives from 2007 to 2008. First elected in 1976, he represented the 169th Legislative District in the state House for the most part of four decades. He served as a member of the Philadelphia City Council for one term, from 2012 to 2016.