TLDR: Mackenzie Phillips played a rebellious teenager on television while living through something far harder off screen. Her own father, Mamas & the Papas founder John Phillips, exposed her to drugs before she was a teenager at all, and the fallout followed her for decades.
Laura Mackenzie Phillips was the daughter of John Phillips, founder of The Mamas & the Papas, and socialite Susan Adams, who divorced when Phillips was just three.
She landed her breakthrough role at 12 in the 1973 film American Graffiti, playing an awkward teenager who connects with a drag racer.
That same childhood put her in direct contact with her father’s rock-star excess. She’s said her dad taught her to roll a joint at age 10, and that by 11 she’d already tried cocaine, believing at the time it was simply a normal part of growing up.
Her Addiction Cost Her the Role Twice
Phillips joined One Day at a Time in 1975, playing headstrong older daughter Julie Cooper opposite Bonnie Franklin. She was arrested for cocaine possession in 1978, and her behavior on set grew erratic enough that producers fired her in 1980, writing her absence into the show as a move to Houston.
She returned in 1981 after entering treatment, touring that same year with her father’s reconstituted band, the New Mamas & the Papas. The reunion with the show proved short-lived: her addiction returned, and she was let go for good in 1983.
Her Memoir Revealed Something Far Harder Than Addiction
In 2009, Phillips published a memoir, High on Arrival, disclosing that her father had sexually abused her starting when she was 18, an incident she first described as rape and later, in the same interview, called a years-long relationship that continued even after her own marriage.
She’s said the two were both deep in addiction throughout that period, and that it ended only once she became pregnant and feared the child might be his.
Not everyone in her family accepted her account. Her stepmother, Michelle Phillips, publicly disputed the allegations, telling reporters Mackenzie had struggled with mental illness and addiction for decades and calling her jealous of siblings who hadn’t developed substance problems of their own.
John Phillips died in 2001, well before the memoir’s publication, and never responded to the claims himself.
Her Own Addiction Followed Her Into Adulthood
In August 2008, Phillips was arrested at Los Angeles International Airport for allegedly attempting to board a flight carrying cocaine and heroin.
The charges were ultimately dismissed in 2010, and Phillips later said she personally thanked the arresting officers, crediting the arrest with saving her life.
She’s since become an outspoken advocate for addiction recovery, describing her own history bluntly in interviews. “I come from a long line of undiagnosed mental illness, rampant addiction and alcoholism,” she’s said, framing her struggles as both genetic and environmental rather than a simple personal failing.
She Kept Working Steadily Despite Everything
Phillips found a real second wind on Netflix’s Orange Is the New Black, playing Barbara, a veterans support group leader, in a role she’s said carried real parallels to her own life.
She’s spoken candidly about appearing on screen without cosmetic surgery, saying plainly she’s “a woman of a certain age” who intends to stay that way.
You can read more about the rest of the One Day at a Time cast in our full guide to the show.
Mackenzie Phillips, Frequently Asked Questions
Why was Mackenzie Phillips fired from One Day at a Time?
She was fired twice, in 1980 and again in 1983, both times due to ongoing struggles with drug and alcohol addiction that made her unreliable on set.
What did Mackenzie Phillips say about her father in her memoir?
In her 2009 memoir High on Arrival, she disclosed that her father, John Phillips of The Mamas & the Papas, sexually abused her starting at age 18, describing it first as rape and later as a years-long relationship. Her stepmother Michelle Phillips publicly disputed the account.
Was Mackenzie Phillips arrested for drugs?
Yes, she was arrested at LAX in August 2008 for allegedly carrying cocaine and heroin. The charges were dismissed in 2010, and she has credited the arrest with helping save her life.
What has Mackenzie Phillips done recently?
She played Barbara, a veterans support group leader, on Netflix’s Orange Is the New Black, and has become a public advocate for addiction recovery.
