Kyle Steven Gallner (born October 22, 1986) is an American actor. He is known for his portrayal of Cassidy "Beaver" Casablancas in the television series Veronica Mars, superhero Bart Allen in the drama series Smallville and Reed Garrett in the police series CSI: NY, and a lead role as Hasil Farrell in the drama series Outsiders. He is also known for his roles in the horror films The Haunting in Connecticut, Jennifer's Body, and the remake of A Nightmare on Elm Street.
Gallner was born in West Chester, Pennsylvania, to Larry and Mary Jane Gallner. He has three siblings: one older sister, one younger brother, and a younger sister. Kyle attended West Chester East High School. He started his career by following his sister along to one of her auditions.
He proceeded to guest star on popular shows such as Judging Amy and Close to Home. Gallner joined the cast of Veronica Mars as Cassidy Casablancas toward the end of the show's first season, in May 2005, before becoming a season regular during the show's second season. After playing Bart Allen in the Smallville episode "Run", Gallner reprised the role on the January 18, 2007, episode "Justice" and the season eight finale. He also guest starred on Cold Case as a teenaged gunman in the episode "Rampage", and appeared in the independent film Sublime. In 2007, he guest starred in an episode of Law & Order: Special Victims Unit titled "Impulsive" as a high school student who accuses his teacher (played by Melissa Joan Hart) of statutory rape. He also guest starred in an episode of Bones as Jeremy Farrell, the suspected murderer of a child beauty-pageant contestant. He also played the lead role in the horror film The Haunting in Connecticut, playing a cancer patient who is tormented by evil spirits.