Daughter of former singer Diane McAfee and actor Brandon Maggart. She was classically trained as a pianist as a child and began composing songs when she was eight years old. She crafted a demo tape while in Los Angeles finishing High School. When she returned home to New York for Christmas one of the tapes found its way to a friend who supervised the care of a music industry executive's children. The executive played the demo's for producer, Andrew Salter who immediately requested a meeting with Fiona. Releasing her first album, Tidal, at the age of seventeen, she earned a Grammy for the song "Criminal". She has released numerous crtically-acclaimed records in her career.