Mackenzie Phillips is an actress and singer best known for her roles in American Graffiti and as rebellious teenager Julie Cooper on the sitcom One Day at a Time. She is most recently known for her role on Disney channel’s science-fiction show So Weird. Mackenzie is the daughter of John Phillips, lead singer of the 60s band, The Mamas and the Papas. As a troubled teen star, Phillips made several visits to rehab before getting sober. Mackenzie's struggles with addiction have been well documented in her bestselling memoir High On Arrival and in the media. She now wishes to use her past experiences to help others and offer hope to individuals who are struggling with substance abuse and addiction.