Liepman started in the story department at William Morris in 1979, became the go-to-person for clients that included Gibson, Denzel Washington, Richard Gere, Kevin Costner, Anthony Hopkins, Jodi Foster and Michelle Pfeiffer.
Her assessment of scripts and story ideas helped shape the success of such movies as the Gibson films Lethal Weapon (1987) and Oscar best picture Braveheart. She later became an independent producer for Mel Gibson's Icon Productions.