A sitdown with actor Brian Geraghty of “Chicago P.D” Posted on September 19, 2014 by Chicago 1 Chicago Chicago News & Search 1 News - 1 eMovies - 1 eMusic - 1 eBooks - 1 Search Search for: Brian Geraghty plays a Chicago cop named Sean Roman, who he describes as a typical blue-collar guy for the NBC’s series, “Chicago P.D.” | Richard A. Chapman/Sun-Times Media 1 Chicago Chicago News & Search 1 News - 1 eMovies - 1 eMusic - 1 eBooks - 1 Search Search for: