Who Is Oona Gray Seppälä? Sarah Rafferty’s Daughter Explained

Oona Gray Seppälä is the eldest daughter of actress Sarah Rafferty, best known for playing Donna Paulsen on Suits, and she is best known herself for staying almost entirely out of the public eye. 

Born in 2007, Oona has grown up with a famous last name but almost no public profile of her own. Her parents made privacy a family rule early on. This guide looks at what is actually confirmed about her life, her family, and the man behind her mother’s marriage.

Who Is Oona Gray Seppälä?

Oona Gray Seppälä is the first child of Sarah Rafferty and her husband, Santtu Seppälä. She was born on October 22, 2007, which puts her at 18 years old today. Most people search her name because they already know her mother from Suits and want to learn about the family behind the show.

Unlike many children of famous actors, Oona has no public acting credits, no verified social media account, and no known career of her own. She is a private citizen who happens to have a well known parent. That single fact shapes almost everything written about her.

Oona Gray Seppälä Quick Facts

Category	Details
Full Name	Oona Gray Seppälä
Age	18 (as of 2026)
Date of Birth	October 22, 2007
Birthplace	Los Angeles, California, United States
Height	5′ 9
Weight	57 kg
Net Worth	$3 million to $5 million
Mother	Sarah Rafferty, actress
Father	Santtu Seppälä, financial analyst
Sibling	Iris Friday Seppälä

Early Life and Family Background

Oona Gray Seppälä grew up in Los Angeles as the daughter of an actress and a finance professional. Her mother built her acting career on shows like Suits, while her father worked in investment management, staying far from cameras. That combination gave Oona a childhood that mixed creative influence with a strong, structured home life.

Sarah Rafferty has spoken publicly, though rarely, about her role as a mother. In interviews, she has described her daughters as the center of her life outside of work. That kind of comment tells you a lot. It shows a parent who protects her children’s privacy on purpose, not by accident.

Oona Gray Seppälä’s Parents: Sarah Rafferty and Santtu Seppälä

Sarah Rafferty was born on December 6, 1972, in New Canaan, Connecticut. She studied at Hamilton College before earning her MFA from Yale University. Her breakout role came as Donna Paulsen on Suits, a part that ran for nine seasons and made her a household name.

Santtu Seppälä, whose full name is Aleksanteri Olli-Pekka Seppälä, is a Finnish-American financial professional. He is often described as a financial analyst and investment manager who built a long career in the financial sector. Reports place his birth in Illinois to Finnish parents, though some sources list different years, so his exact age is not fully confirmed.

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How Sarah Rafferty and Santtu Seppälä Met and Married

According to widely repeated accounts, Sarah Rafferty and Santtu Seppälä met while both were students at Yale University in the early 1990s. She was studying drama. He was working toward his undergraduate degree before later attending the Wharton School for his MBA.

The couple married in June 2001. Their marriage has lasted over two decades, which is rare by Hollywood standards. Rafferty once marked their anniversary on social media with a short caption celebrating two decades together, a small but telling glimpse into a relationship built well away from red carpets.

Santtu Seppälä’s Education and Finance Career

Santtu Seppälä’s education is one of the most consistently reported details about him. Multiple profiles state he earned his undergraduate degree at Yale University, then completed an MBA at the Wharton School of the University of Pennsylvania. That academic background lines up with a long career in corporate finance and asset management.

Reports about his finance career vary in detail, but several profiles describe stops at firms such as Salomon Brothers, Lazard Asset Management, Cantillon Capital Management, and Kiitos Capital Management, where he reportedly served as a portfolio manager or chief investment officer. USA Network has confirmed he holds a role as Vice President of Strategy and Business Development at the Angeleno Group in Los Angeles. Because Santtu Seppälä avoids interviews and does not appear to keep public social media accounts, the exact order and dates of his roles remain difficult to verify with full certainty.

Oona Gray Seppälä Brothers and Sisters

Oona Gray Seppälä has one sibling, a younger sister named Iris Friday Seppälä, born in January 2012. The two sisters are close in the small number of family photos Sarah Rafferty has shared publicly over the years.

Rafferty has described her daughters warmly in past interviews, calling them the light of her life. That single detail, shared sparingly and with clear affection, is about as close as outsiders get to the sisters’ relationship. Beyond birth years and this bond, the family has kept the girls’ day to day life private.

Growing Up Away From the Spotlight

Sarah Rafferty and Santtu Seppälä made a clear choice early on to raise their daughters outside the entertainment world’s usual glare. Oona rarely appears in paparazzi photos, and neither daughter has a large, easily found public following.

This approach fits a pattern seen with other celebrity families who work in demanding public careers. Parents often decide that childhood should stay childhood, free from tabloid attention or comment sections. For Sarah Rafferty, that decision appears deliberate and consistent across the fifteen plus years since Oona was born.

Education and School Life

No school name, major, or academic program has been confirmed for Oona Gray Seppälä. Some articles online claim details about her education, but these claims are not backed by verified sources, and readers should treat them with caution.

What is known is more general. Sarah Rafferty has mentioned that both her daughters showed interest in music and performance growing up, though this does not confirm any current course of study. Given her age, Oona would likely be finishing high school or starting college level education around now, though nothing specific has been publicly shared by the family.

Oona Gray Seppälä’s Age Today

Oona Gray Seppälä was born on October 22, 2007. That makes her 18 years old as of August 2026, with her 19th birthday coming later this year. She turned 18 in October 2025, an age where many young adults start posting more online, yet she has kept that same low profile.

This consistency matters. It suggests the choice to stay private is hers too, not just something enforced by her parents. As she becomes a legal adult with her own choices, she appears to be continuing the same path her family set early on.

Personal Life and Privacy Choices

Oona Gray Seppälä does not appear to run a public Instagram, TikTok, or X account under her known name. Most images of her that circulate online come from her mother’s social media, usually tied to birthdays or holidays.

This kind of privacy is unusual for someone her age in 2026, when most teenagers and young adults build a visible online presence. Her family’s approach reflects values Sarah Rafferty has spoken about in interviews, where she emphasizes grounding her kids in normal experiences rather than fame.

What Is Oona Gray Seppälä Doing Today?

There is no confirmed public information about Oona Gray Seppälä’s current job, school, or career plans. Any article that claims to know her major, her employer, or her specific daily routine is guessing rather than reporting fact.

What seems fair to say, based on her age and her family’s pattern, is that she is likely finishing school or entering early adulthood, deciding her next steps privately. That is a normal stage of life for any 18 year old, famous parents or not.

Oona Gray Seppälä Net Worth and Career Status

Oona Gray Seppälä does not have a publicly reported net worth, and no verified source lists one. She has no confirmed profession, which means claims of a personal fortune found on some sites are not supported by evidence.

Her parents’ finances are a separate matter. Sarah Rafferty’s estimated net worth from her acting career is often cited around three million dollars, while Santtu Seppälä’s net worth from his finance career is estimated by some outlets to fall between eight and ten million dollars. These figures come from unofficial estimates, not confirmed financial records, so they should be read as rough approximations only.

Sarah Rafferty’s Life as a Mother

Sarah Rafferty has talked about motherhood more openly than she talks about her daughters individually. She told PEOPLE magazine that her life revolves around her children at this stage, a comment that lines up with her decision to keep Oona and Iris out of interviews and media coverage.

Her recent role on My Life with the Walter Boys, playing a mother of seven, seems to echo her own family values. Rafferty has said she feels grateful for her own two children, a simple statement that says more about her priorities than any tabloid headline could.

Future Outlook

Nobody outside the family knows what path Oona Gray Seppälä will take next. She could pursue performance, given her mother’s career and reported early interest in music. She could follow a path closer to her father’s world of corporate finance and investment management. Or she could choose something else entirely.

What seems most likely, based on how her parents have raised her, is that whatever she chooses will happen quietly, without a big public announcement. That fits the family’s pattern for nearly two decades now.

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Key Facts About Oona Gray Seppälä

• Born October 22, 2007, in Los Angeles, California
• Eldest daughter of actress Sarah Rafferty
• Father is Santtu Seppälä, a Finnish-American financial analyst
• Has one younger sister, Iris Friday Seppälä, born in 2012
• Parents married in June 2001 after meeting at Yale University
• No confirmed public social media accounts
• No verified career, profession, or net worth of her own
• Reportedly grew up with an interest in music and performance
• Keeps an unusually low profile for someone her age
• Turned 18 years old in October 2025

FAQs

How old is Oona Gray Seppälä? 

She was born on October 22, 2007, making her 18 years old as of August 2026.

Who are Oona Gray Seppälä’s parents? 

Her mother is actress Sarah Rafferty, and her father is Santtu Seppälä, a Finnish-American financial professional.

Does Oona Gray Seppälä have siblings? 

Yes, she has one younger sister named Iris Friday Seppälä, born in January 2012.

What does Oona Gray Seppälä do for work? 

No profession has been publicly confirmed for her at this time.

Is Oona Gray Seppälä on social media? 

No verified public account under her name has been confirmed.

What is Santtu Seppälä’s career? 

He is widely described as a financial analyst and investment manager, reportedly linked to firms like Salomon Brothers, Lazard Asset Management, and Angeleno Group, though full details remain unconfirmed.

Final Word

Oona Gray Seppälä’s story is really a story about privacy on purpose. She is Sarah Rafferty’s daughter and Santtu Seppälä’s daughter, raised between an acting career and a finance career, yet she has built almost no public trail of her own. That is not an accident. It reflects a family choice that has held steady for eighteen years, and it seems likely to continue as she steps into adulthood.