Joseph Francis Mazzello (born September 21, 1983), sometimes credited as Joe Mazzello, is an American actor, director, and screenwriter. He is best known for his roles as Tim Murphy in Jurassic Park (1993), Eugene Sledge in the HBO miniseries The Pacific (2010), Dustin Moskovitz in The Social Network (2010) and Queen bass player John Deacon in the biopic Bohemian Rhapsody (2018).