Maggie Siff was born on June 21, 1974, in The Bronx, New York City. She is an American actress best known for her roles in Mad Men, Sons of Anarchy, and Billions.
Her career spans regional theater, major television dramas, and independent film, earning her multiple award nominations over two decades.
Who is Maggie Siff?
Maggie Siff is an American actress whose television work has made her one of the most recognized dramatic performers of her generation. She first gained wide attention playing Rachel Menken Katz on the AMC drama Mad Men starting in 2007.
Her breakthrough into mainstream recognition came through the FX series Sons of Anarchy, where she played Dr. Tara Knowles from 2008 onward. That role earned her two nominations for the Critics’ Choice Television Award for Best Supporting Actress in a Drama Series.
Since 2016, Siff has starred as psychiatrist Wendy Rhoades on the Showtime series Billions, opposite Paul Giamatti and Damian Lewis. The character is a performance coach for a hedge fund, a role Siff prepared for partly using her own experience working at a hedge fund after college.
She also works as a producer, serving in that capacity on the 2016 indie film A Woman, a Part, in which she also starred. Her career covers theater, film, television, voice work, and brand representation.
Early Life of Maggie Siff
Maggie Siff grew up in The Bronx, New York City, where her interest in performing developed from an early age. Her father came from a Russian Jewish family, while her mother is of Irish and Swedish descent. Siff has described herself as feeling “culturally Jewish” because of her upbringing in her father’s tradition.
Her father worked as a stage actor, which gave her early exposure to the world of live performance. That environment planted the seeds for a career that would eventually take her from regional theater to major network television.
Siff attended The Bronx High School of Science, a highly selective public school in New York City known for its rigorous academic program. Her time there shaped both her intellectual curiosity and her discipline as a performer.
Maggie Siff Age
Maggie Siff is 52 years old as of 2026, born on June 21, 1974. Her star sign is Gemini.
She began her on-screen career at age 30, making her television debut in 2004. By her early forties, Siff was starring in one of Showtime’s most-watched dramas.
Maggie Siff Ethnicity and Nationality
Maggie Siff is American by nationality, born and raised in New York City. Her ethnic background is mixed: her father is of Russian Jewish heritage, and her mother is of Irish and Swedish descent.
She has publicly identified as culturally Jewish. That mixed background has informed some of the roles she has taken, including Rachel Menken Katz in Mad Men, whose Jewish identity is a significant part of the character.
Maggie Siff Height and Weight
Maggie Siff stands at 5 ft 7 in (170 cm) tall. Her weight is reported to be around 57 kg (126 lbs).
She carries a lean and athletic frame that translates well to both stage and screen. Her physical presence contributes to the commanding quality many of her characters project.
Maggie Siff Education
Siff graduated from Bryn Mawr College in 1996 with a bachelor’s degree in English. Bryn Mawr is a women’s liberal arts college in Pennsylvania, well regarded for its strong humanities programs.
After Bryn Mawr, she enrolled in the Graduate Acting Program at New York University’s Tisch School of the Arts, where she completed her M.F.A. in acting. That advanced training gave her the technical foundation she later brought to demanding dramatic roles.
Shortly after graduation, Siff worked as a temp at a Wall Street hedge fund. She later drew directly on that experience when preparing to play Wendy Rhoades in Billions.
Maggie Siff Career
Maggie Siff built her career methodically, starting with years of regional theater before moving into television and film. Her stage roots gave her a depth of craft that set her apart in complex dramatic roles.
Theater Roots and Television Debut
Before appearing on screen, Siff worked extensively in regional theater across the United States. In 1998, she won a Barrymore Award for Excellence in Theater for her performance in Henrik Ibsen’s Ghosts at Lantern Theater Company in Philadelphia.
Siff made her television debut in 2004 with a guest role in the NBC drama Third Watch. The following year, she appeared in a Season 2 episode of Rescue Me, playing a young woman at an Alcoholics Anonymous meeting.
By 2006, she had added credits on Law & Order: Special Victims Unit and Grey’s Anatomy. Those early appearances were brief, but each one gave her a foothold in a competitive industry.
Mad Men and Sons of Anarchy
Siff’s career shifted significantly when she joined Mad Men in 2007. She played Rachel Menken Katz, a Jewish department store heiress who becomes romantically linked to Don Draper, played by Jon Hamm. The role appeared as a main part in Season 1, with guest appearances in Seasons 2 and 7.
That performance earned Siff a nomination, along with the Mad Men ensemble, for a Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Drama Series. The show brought her to the attention of industry decision-makers at a critical moment in her career.
In 2008, Siff joined the FX crime drama Sons of Anarchy as Dr. Tara Knowles, the girlfriend and eventual wife of protagonist Jax Teller, played by Charlie Hunnam. She remained a main cast member through the show’s sixth season in 2013.
The role earned her two consecutive nominations for the Critics’ Choice Television Award for Best Supporting Actress in a Drama Series, in 2012 and 2014.
During the same period, Siff appeared in several films. She played Lily in Then She Found Me (2007), Teresa Stowe in Push (2009), Rabbi Renannah Zimmerman in Leaves of Grass (2009), and Rachel in Funny People (2009) alongside Adam Sandler. In 2013, she appeared in Concussion opposite Robin Weigert, playing Sam Bennet.
Billions, A Woman a Part, and Recent Work
In 2016, Siff joined the Showtime drama Billions as Wendy Rhoades, a psychiatrist serving as the in-house performance coach at Axe Capital. Her character occupies a unique position in the series: married to U.S. attorney Chuck Rhoades, played by Giamatti, while professionally aligned with his nemesis, Bobby Axelrod, played by Lewis. The show ran through 2023, and Siff appeared throughout all seven seasons.
That same year, Siff starred in and executive produced A Woman, a Part, an independent film directed by Elisabeth Subrin. She also appeared in The 5th Wave (2016) and the drama The Sweet Life (2016).
In 2018, Siff began serving as the television spokesperson for Betterment, an online financial advisory service. She also narrated the audiobook of Gwendy’s Button Box by Stephen King and Richard Chizmar, and later the sequel Gwendy’s Magic Feather.
Her film Resistance: They Fought Back, released in 2024, holds a 100% score on Rotten Tomatoes. In 2026, Siff made her West End debut at the Aldwych Theatre in London, playing Joy Davidman in Shadowlands opposite Hugh Bonneville, who played C.S. Lewis.
Maggie Siff Filmography
- Michael Clayton (2007) as Attorney
- Then She Found Me (2007) as Lily
- Push (2009) as Teresa Stowe
- Leaves of Grass (2009) as Rabbi Renannah Zimmerman
- Funny People (2009) as Rachel
- Concussion (2013) as Sam Bennet
- The 5th Wave (2016) as Lisa Sullivan
- A Woman, a Part (2016) as Anna Baskin (also executive producer)
- The Sweet Life (2016) as Ava
- One Percent More Humid (2017) as Lisette
- The Short History of the Long Road (2019) as Cheryl
- Resistance: They Fought Back (2024) as Vladka Meed (voice)
Maggie Siff Awards and Recognition
Siff won the Barrymore Award for Excellence in Theater in 1998 for her performance in Ghosts at Lantern Theater Company. That early recognition came before she had any screen credits and reflected the strength of her stage work.
She earned a Screen Actors Guild Award nomination in 2008 as part of the Mad Men ensemble for Outstanding Performance by an Ensemble in a Drama Series. The nomination placed her among some of the most acclaimed performers working in American television at the time.
Her work on Sons of Anarchy brought two Critics’ Choice Television Award nominations for Best Supporting Actress in a Drama Series, in 2012 and 2014. Resistance: They Fought Back, her 2024 film, holds a 100% critics rating on Rotten Tomatoes.
Maggie Siff Husband
Maggie Siff married Paul Ratliff in 2012. Ratliff worked as an American psychologist and mental health practitioner.
In October 2013, Siff announced that she was expecting her first child. Her daughter Lucy arrived in 2014.
Paul Ratliff died in 2021 from brain cancer. Since his death, Siff has kept her personal life largely private.
Maggie Siff Children
Maggie Siff and Paul Ratliff have one daughter, Lucy, born in 2014. Siff gave birth to Lucy at age 39.
She has spoken in interviews about balancing her acting career with motherhood. In one exchange around the time she was filming early seasons of Billions, she described her life as split between playing a powerful on-screen character and being at home on the floor with her baby.
Lucy has grown up largely out of the public eye, which reflects Siff’s deliberate approach to keeping her family’s private life separate from her professional one.
Maggie Siff Net Worth
Maggie Siff’s estimated net worth is $8 million as of 2026. Her income derives from more than two decades of work across theater, television, film, and brand representation.
Her longest-running television commitment was Billions, where she held a main cast role across all seven seasons from 2016 to 2023 on Showtime.
Prior to that, Sons of Anarchy kept her in a primary role on FX for six seasons. Both represent substantial television salaries over extended periods.
Siff has also worked as a television spokesperson for Betterment, an online investment platform, since 2018. Her film and audiobook work, including narrating Stephen King’s Gwendy’s Button Box, add further income streams to her portfolio.
Maggie Siff Social Media
Maggie Siff maintains a presence on Instagram. Her verified handle is @maggiesiff, where she shares updates on her work and personal life.
She keeps her social media activity relatively low-key compared to many performers of similar profile. That restraint is consistent with the private approach she takes to her personal life.
The Bottom Line
Maggie Siff earned two Critics’ Choice Television Award nominations for Sons of Anarchy and went on to anchor all seven seasons of Billions on Showtime alongside Paul Giamatti and Damian Lewis. Her 2026 West End debut in Shadowlands at the Aldwych Theatre in London marked her return to the stage for the first time in years.
Born in The Bronx to a stage actor father, Siff trained at Bryn Mawr College and NYU’s Tisch School of the Arts before winning a Barrymore Award for theater in 1998. That foundation in live performance gives her screen work a texture that critics and audiences have consistently recognized over twenty years.
She continues to take on projects across multiple formats, from voice work to London theater.
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