Robert Harper (born May 19, 1951) is an American actor. He is perhaps most well known for his role as Sharkey in Once Upon a Time in America. He has also portrayed Charlie Gereson in Creepshow and Bubba 'Si' Weisberger in the CBS sitcom Frank's Place. Other film credits include Wiseguy, Final Analysis, The Insider, Deconstructing Harry, and Molly. He has appeared on Broadway in Once in a Lifetime (directed by Tom Moore), The Inspector General and Arthur Miller's The American Clock.In May 2007 Mr. Harper delivered the Commencement Address at University College, Rutgers.