Joseph Francis Mazzello III is an American actor. He is best known for his roles as Tim Murphy in Jurassic Park, Roarke Hartman in The River Wild, Eugene Sledge in the HBO miniseries The Pacific, Dustin Moskovitz in The Social Network, and Queen bass player John Deacon in the biopic Bohemian Rhapsody.

Jurassic Park is a 1993 American science fiction action film directed by Steven Spielberg, produced by Kathleen Kennedy and Gerald R. Molen, and starring Sam Neill, Laura Dern, Jeff Goldblum, and Richard Attenborough. It is the first installment in the Jurassic Park franchise, and the first film in the original Jurassic Park trilogy, and is based on Michael Crichton's 1990 novel of the same name, with a screenplay by Crichton and David Koepp. The film is set on the fictional island of Isla Nublar, off Central America's Pacific Coast near Costa Rica, where a wealthy businessman John Hammond (Attenborough), and a team of genetic scientists have created a wildlife park of de-extinct dinosaurs. When industrial sabotage leads to a catastrophic shutdown of the park's power facilities and security precautions, a small group of visitors, including Hammond's grandchildren, struggle to survive and escape the now perilous island.