Joseph Mazzello is an American actor. His Hollywood career started in the 1990s as a child performer. He made his film debut in Presumed Innocent. His role in the movie Radio Flyer got him a nomination for a Young Artist Award for Best Young Actor Under 10 in a Motion Picture. He then gained mainstream recognition for his role as Tim Murphy in the movie Jurassic Park. Afterwards, he starred in the films Shadowlands, The Cure, and Three Wishes. In the 2010s, he played the lead role of Eugene Sledge on the miniseries The Pacific. He next appeared on another miniseries, Coma. In addition, he portrayed Dustin Moskovitz in The Social Network and starred as Mouse in G.I. Joe: Retaliation.