Mackenzie Phillips is an American actress and singer, known for her roles as Carol Morrison in the film American Graffiti, as teenager Julie Mora Cooper Horvath on the sitcom One Day at a Time, and as Molly Phillips on the Disney Channel supernatural series So Weird.
Phillips was 12 years old during the filming of American Graffiti, and 13 when the movie was released. She was cast as Carol Morrison, a young girl accidentally picked up by hot rodding teenager John Milner (Paul Le Mat).
Phillips gained stardom in the 1970s playing teenager Julie Cooper on the long-running television show One Day at a Time.
From the mid 1980s to the early 1990s, Phillips performed as a singer and toured with a re-formed version of The Mamas & the Papas, known as The New Mamas and The Papas.
In 1999, Phillips co-starred with Cara DeLizia in the Disney Channel series So Weird, playing a fictional rock star named Molly Phillips. She sang original songs written by show producers Jon Cooksey and Ann Marie Montade. In 2002, she appeared in the Disney Channel original movie Double Teamed. Phillips guest-starred on episodes of ER, Without a Trace, 7th Heaven, Cold Case, and Beverly Hills, 90210.
In 2016, Phillips began working at the Breathe Life Healing Center in West Hollywood, California as a drug rehab counselor.
In 2017, Phillips appeared in an episode of the rebooted One Day at a Time as Pam Valentine. She reprised the role in 2019, in two episodes of the third season.
In 2018, Phillips appeared as Barbara Denning in multiple episodes of Netflix original Orange Is the New Black.