Amy Acker is an American actress, best known as Winifred "Fred" Burkle on Angel, another Joss Whedon show - she also played "Whiskey" in his Dollhouse. She was cast as villainous Kelly Peyton in Season Five of the series Alias, starting as a guest star until ultimately being upped to a series regular.

Up to end of season 4, she has been seen only once as Audrey Nathan, the cellist love of Phil Coulson's life, a character who was even referenced in The Avengers.

She had a regular role as Samantha "Root" Groves in Person of Interest.