|Age/Date of Birth|| 22, 1986|
West Chester, Pennsylvania
Gallner was born in West Chester, Pennsylvania. 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.
Gallner also guest starred on the fourth season premiere of the AMC horror drama series The Walking Dead as Zach, the new boyfriend of character Beth Greene.