Leven Rambin decided to pursue an acting career from early on in her life. She starred in several school plays and also trained at the Houston School of Film and Theatre before she moved to Los Angeles. She got her first acting role in 2004, when she joined the cast of the daytime soap All My Children where she played the role of Lily Montgomery.
Three years later, Rambin was yet given another role in the daytime drama. She played the role of Ava Benton, the half-sister of Lily. She continued to juggle both roles until February 2008, when Ava last appeared on the program. Lily would last appear four months later. Both roles, however, would earn her Daytime Emmy nominations, in 2006 and 2007.
Rambin also had other roles, this time for prime time programs. She played guest roles in Law & Order: Special Victims Unit and Lipstick Jungle, and also had a recurring role in The Book of Daniel. Her most recent gigs include Terminator: The Sarah Connor Chronicles, Grey's Anatomy, Scoundrels, CSI: Miami and One Tree Hill.