Callan McAuliffe is an Australian actor. His acting career started in the mid-2000s. He made his screen debut in a short film. He made his television debut in Comedy Inc. He later made guest appearances in the shows Blue Water High and Packed to the Rafters. In 2010, he made his film debut in the movie Flipped. This also marked his first lead role on the big screen. He next starred as Sam Goode in the film I Am Number Four. After this, he portrayed the Young Jay Gatsby in the movie The Great Gatsby. His latest films were The Stanford Prison Experiment, Hacker, and The Legend of Ben Hall. He also plays the recurring role of Alden in The Walking Dead.