Most young people have never heard of Pat O'Brien. He was a popular actor who appeared in more than 100 films, playing mostly Irish American characters. He played priests, cops, and members of the military. He had starring roles in "Knute Rockne, All American," with Ronald Reagan playing the part of George Gipp. In the film, Rockne used a slogan that was used in Reagan's campaign for president in 1980, "Win One for the Gipper." Pat appeared in "Some Like it Hot" with Marilyn Monroe. And his last role came in a 1982 episode of "Happy Days." O'Brien was born in Milwaukee and served as an altar boy at Gesu church. He grew up on 13th and Kilbourn in Milwaukee and attended Marquette Academy with fellow actor Spencer Tracy. Pat also attended Marquette University where he decided to take up acting.