What does it take for a ten-year-old to be singled out by The Hollywood Reporter as a “theatrical standout”? For Sophia Reid-Gantzert, the answer traces back to a decade of ballet training that started before she could read. Born in Port Coquitlam, British Columbia, in 2010, she grew up in a household where performance was already familiar, thanks to an older sister who works as an award-winning documentary filmmaker. Sophia’s own path started in dance, not on camera.
By age six, she had already won the Vienna International Ballet Experience in Austria, and she went on to train at institutions as respected as the Paris Opera Ballet. Acting came a few years later, beginning with a small role in the 2017 TV movie The Sweetest Christmas. The real turning point arrived in 2020, when she was cast as Karen Brewer in Netflix’s The Baby-Sitters Club, a performance that earned praise across major outlets and established her as a name to watch.
From there, Sophia Reid-Gantzert‘s career has only expanded, taking her into fantasy comedy, studio films, and mystery dramas alongside seasoned actors. This biography looks at how a competitive young dancer became one of Canada’s most closely watched young actresses.
Who is Sophia Reid-Gantzert?
Sophia Reid-Gantzert began dancing at age two and was winning international ballet titles by age six, long before most kids even consider a stage career. Today, Sophia Reid-Gantzert is best known to television audiences as Karen Brewer in Netflix’s The Baby-Sitters Club, a role that turned a competitive ballerina from British Columbia into one of Canada’s most recognizable young actresses.
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As of 2026, Sophia Reid-Gantzert balances a growing filmography with continued dance training, and her path from studio recitals to network sets offers a clear look at how a child performer builds a lasting career. This biography walks through her early life, her ballet training, her breakout television role, and her most recent projects.
Quick Facts About Sophia Reid-Gantzert
| Field | Details |
|---|---|
| Full Name | Sophia Reid-Gantzert |
| Date of Birth | January 18, 2010 |
| Age (as of 2026) | 16 years old |
| Birthplace | Port Coquitlam, British Columbia, Canada |
| Nationality | Canadian |
| Occupation | Actress, dancer |
| Years Active | 2017–present |
| Known For | The Baby-Sitters Club, Popular Theory, 8-Bit Christmas |
| Family | Youngest of six children |
Early Life and Family Background in Vancouver
Sophia Reid-Gantzert was born on January 18, 2010, in Port Coquitlam, British Columbia, a suburb in the Greater Vancouver area. She is the youngest of six children born to Kerri-Ann Reid and René Gantzert. That large family environment shaped much of her early exposure to performance, since several of her siblings were involved in creative fields before she was.
Her older sister, Mackenzie Reid Rostad, is an award-winning documentary and short-film maker, giving Sophia an early window into professional filmmaking long before she stepped in front of a camera herself. Growing up in the Vancouver area also placed her close to one of North America’s busiest film and television production hubs, which later made it easier for her to audition regularly without relocating her family.
Sophia’s earliest creative outlet wasn’t acting at all. It was dance. Her family enrolled her in classes almost as soon as she could walk, and that early dance training became the foundation for everything that followed. However, it was her natural stage presence during dance recitals that first hinted she might also have a future in scripted performance.
Classical Ballet Training and Early Competition Wins
Long before her acting career took shape, Sophia Reid-Gantzert was already a serious competitive dancer. She began training at age two at Encore Dance Academy, then transferred in September 2014 to Caulfield School of Dance to study jazz, musical theatre, and classical ballet. That combination of disciplines gave her a broad performance toolkit that would later translate well to acting.
At just six years old, she won the Vienna International Ballet Experience in Austria, competing in the solo division for dancers age seven and under. It was her first major international title, and it set the tone for a decade of competitive success. She went on to win gold medals at ballet competitions across the United States, Canada, the United Kingdom, and continental Europe.
Her ballet resume includes a full scholarship to train at a respected London ballet academy, along with study time at the prestigious Paris Opera Ballet and at Danceworks Ballet Academy. She also earned first place and a Special Jury Prize at the Ballet Beyond Borders competition in the United States. According to IMDb, she became one of the youngest dancers ever accepted into the Paris Opera Ballet’s summer program, a notable achievement in a field where placement is highly competitive even for adult dancers.
Acting Debut and Early Television Roles
Sophia Reid-Gantzert made her professional acting debut in 2017 in the television film The Sweetest Christmas, playing a character named Harper. It was a modest start, but it opened the door to a string of guest and supporting roles over the following two years.
She appeared in the mystery TV movie Darrow & Darrow: In the Key of Murder, as well as the holiday film Holiday Harmony and the seasonal title Easter Under Wraps. She also landed a brief guest appearance in the seventh season of Once Upon a Time, a fantasy drama with an established fanbase that gave her early exposure to a wider television audience.
These first few years followed a familiar pattern for young Canadian performers: a mix of TV movies, holiday specials, and guest spots that build credits and audition tape while a bigger break is still ahead. For Sophia, that bigger break arrived in 2020.
Breakout Role as Karen Brewer in The Baby-Sitters Club
In 2020, Sophia Reid-Gantzert landed the recurring role of Karen Brewer in Netflix’s reboot of The Baby-Sitters Club, based on Ann M. Martin’s long-running book series. Karen is written as the outspoken, strange, and imaginative stepdaughter of Watson Brewer, and the role called for comic timing well beyond what most of Sophia’s earlier credits had required.
The series, which also starred Alicia Silverstone and Mark Feuerstein, earned strong reviews across the board, and Sophia’s performance was specifically singled out. The Hollywood Reporter’s Robyn Bahr described her as a theatrical standout among the young cast. The Hindu praised her for playing the role “with complete gusto.” Paste magazine’s Alexis Gunderson listed the show’s ensemble, Sophia included, among the best performances on television that year.
The Baby-Sitters Club ran for two seasons, 2020 to 2021, and remains the project most closely associated with her name. It also marked the moment her career shifted from scattered guest roles to a recurring lead, giving her the kind of sustained screen time that builds a genuine following.
Expanding Her Range with Scaredy Cats and 8-Bit Christmas
Following the success of The Baby-Sitters Club, Sophia Reid-Gantzert took on a lead role in Netflix’s YA fantasy comedy series Scaredy Cats in 2021. The show leaned into genre elements quite different from the grounded family comedy of her earlier work, giving her a chance to demonstrate range beyond a single type of role.
That same year, she appeared in the feature film 8-Bit Christmas, a nostalgic comedy set in the late 1980s. The film gave her a supporting role in a larger ensemble cast working with an established studio release, a step up in production scale from her earlier TV movie credits.
Together, Scaredy Cats and 8-Bit Christmas showed a clear pattern in her early career: rather than repeating the same kind of role, she moved between grounded family drama, fantasy comedy, and studio holiday films. For a performer still in her early teens at the time, that variety mattered for building a resume that wasn’t tied to a single character type.
Recent Film and Television Work
By the mid-2020s, Sophia Reid-Gantzert had moved into more prominent leading roles. In 2024, she took the lead in the coming-of-age film Popular Theory, appearing alongside established names Cheryl Hines, Chloe East, and Marc Evan Jackson. Landing a lead role opposite performers with that level of name recognition marked a clear step up in the scale of projects she was being cast in.
That same year, she also joined the cast of Hulu’s mystery series Death and Other Details, appearing opposite Mandy Patinkin, an actor with decades of television and film credits. The series blended crime, drama, and mystery elements, again pulling Sophia into a genre distinct from her earlier family-comedy work.
Her filmography also includes the comedy project Free Bert, listed among her upcoming and recent credits. Taken together, her 2024 and 2026 slate reflects a performer moving from child-actor ensemble casting into more central, character-driven roles, a transition that doesn’t happen for every young performer who starts out in holiday TV movies.
Awards Recognition and Critical Reception
Much of the critical recognition Sophia Reid-Gantzert has received traces back to her performance as Karen Brewer. Being named a standout by The Hollywood Reporter and included in Paste’s list of the year’s best television performances is a notable level of critical attention for an actress who was around ten years old at the time.
Her dance career carries its own separate track record of recognition, including her win at the Vienna International Ballet Experience, her placement at Ballet Beyond Borders, and her acceptance into the Paris Opera Ballet’s summer program. Few young actresses can point to a competitive, juried dance resume running in parallel with a television career, and that dual track has become part of what distinguishes her public profile from other child performers of her generation.
As of 2026, she has not been the recipient of a major screen-acting award such as a Canadian Screen Award nomination in a lead category, based on publicly available records. Her recognition to date has come primarily through critical praise and casting momentum rather than formal industry awards.
Education and Balancing School with a Performing Career
Like many young performers, Sophia Reid-Gantzert has had to balance formal schooling with an active production schedule. As of 2016, she was enrolled at Meadowridge School in Maple Ridge, British Columbia, a private school located within reasonable driving distance of Vancouver’s production studios.
Alongside traditional schooling, she pursued additional training relevant to her career, studying musical theatre in England and training in film and television acting in Vancouver through both the Vancouver Young Actors’ School and the LeBlanc School of Acting.
That combination of academic schooling and specialized performance training is a common structure among working child actors in Canada, where a strong local production industry allows young performers to train and work without moving to Los Angeles. Details about her current school enrollment or grade level beyond what has been publicly reported are not confirmed, and this article does not speculate beyond documented sources.
Personal Information of Sophia Reid-Gantzert
Full Name
Sophia Reid-Gantzert’s full name, as recorded in public sources, is Sophia Reid-Gantzert.
Date of Birth
Sophia Reid-Gantzert was born on January 18, 2010.
Age
As of 2026, Sophia Reid-Gantzert is 16 years old.
Birthplace
Sophia Reid-Gantzert was born in Port Coquitlam, British Columbia, Canada.
Nationality
Sophia Reid-Gantzert holds Canadian nationality.
Education
Sophia Reid-Gantzert was reported, as of 2016, to attend Meadowridge School in Maple Ridge, British Columbia, alongside additional training in musical theatre and film/TV acting.
Hobbies and Interests
Sophia Reid-Gantzert is an accomplished ballerina and has trained in jazz and musical theatre alongside her acting career.
Marital Status
Not applicable. Sophia Reid-Gantzert is a minor and has no publicly reported relationship status.
Family
Sophia Reid-Gantzert is the youngest of six children born to Kerri-Ann Reid and René Gantzert.
Family, Siblings, and Parents
Sophia Reid-Gantzert’s parents are Kerri-Ann Reid and René Gantzert, and she is the youngest of six children in the family. Her older sister, Mackenzie Reid Rostad, works as a documentary and short-film maker who has received her own industry awards, giving the Reid-Gantzert family a notable presence behind and in front of the camera.
Public sources do not name Sophia’s other four siblings or provide confirmed details about their careers, so this article does not speculate on names or occupations that have not been documented. What is consistently reported across sources is the size of the family and the fact that creative and performing arts run through more than one sibling.
The family’s roots in the Greater Vancouver area, specifically Port Coquitlam, placed Sophia within reach of British Columbia’s dance schools and its film production industry from a young age, a geographic advantage that likely supported both her ballet training and her early acting auditions.
Social Media Profiles
Sophia Reid-Gantzert maintains a public presence on Instagram, where she shares updates related to her acting and dance work.
@sophiareidgantzert
Public, verified handles for other platforms such as Facebook, X (formerly Twitter), TikTok, YouTube, or LinkedIn are not consistently documented in available public sources as of 2026, so they are not listed here to avoid misattributing an account to her.
Frequently Asked Questions
How old is Sophia Reid-Gantzert?
Sophia Reid-Gantzert was born on January 18, 2010, making her 16 years old as of 2026.
Where is Sophia Reid-Gantzert from?
She was born in Port Coquitlam, British Columbia, Canada, and grew up in the Greater Vancouver area.
What is Sophia Reid-Gantzert known for?
Sophia Reid-Gantzert is best known for playing Karen Brewer in Netflix’s The Baby-Sitters Club, along with roles in Popular Theory and 8-Bit Christmas.
Is Sophia Reid-Gantzert a trained dancer?
Yes. She trained in classical ballet from age two and has won international competitions, including the Vienna International Ballet Experience at age six.
What was Sophia Reid-Gantzert’s first acting role?
Her professional acting debut was in the 2017 television film The Sweetest Christmas, in which she played Harper.
Who are Sophia Reid-Gantzert’s parents?
Her parents are Kerri-Ann Reid and René Gantzert.
Does Sophia Reid-Gantzert have siblings?
Yes. She is the youngest of six children. Her sister Mackenzie Reid Rostad is a documentary and short-film maker.
What TV shows has Sophia Reid-Gantzert appeared in?
Her television credits include The Baby-Sitters Club, Scaredy Cats, Once Upon a Time, Darrow & Darrow: In the Key of Murder, and Death and Other Details.
Did Sophia Reid-Gantzert win any ballet competitions?
Yes. She has won gold medals at ballet competitions in the United States, Austria, Canada, and the United Kingdom, including first place at Ballet Beyond Borders.
What is Sophia Reid-Gantzert’s most recent project?
As of 2026, her recent and upcoming credits include the comedy Free Bert and the Hulu series Death and Other Details.
Has Sophia Reid-Gantzert received any award nominations?
Public records do not show a formal industry award nomination for her acting as of 2026, though she has received strong critical praise from outlets including The Hollywood Reporter and Paste.
Where did Sophia Reid-Gantzert train in ballet?
She trained at Encore Dance Academy, Caulfield School of Dance, a London ballet academy, the Paris Opera Ballet, and Danceworks Ballet Academy.
Conclusion
Sophia Reid-Gantzert’s career reflects an unusually deliberate path for a young performer, built on years of competitive ballet training before she ever appeared on screen. That foundation carried her from a small role in a 2017 holiday movie to a breakout, critically praised performance as Karen Brewer, and eventually into leading roles alongside established actors like Cheryl Hines and Mandy Patinkin.
As of 2026, Sophia Reid-Gantzert continues to work across genres, from family comedy to mystery drama, while maintaining the dance background that first put her in front of an audience. For anyone following her career, the clearest throughline is consistency: steady training, steadily bigger roles, and a family environment already familiar with creative work.
