Peter Steinfeld is an American personal fitness trainer, entrepreneur, and the father of actress and singer Hailee Steinfeld. Long before Hailee became an Oscar-nominated actress, Marvel star, singer, wife of NFL quarterback Josh Allen, and mother, Peter Steinfeld had already spent decades working in fitness. He founded Better Shape-Up, trained celebrity clients, and later became one of Hailee’s most trusted trainers for tours and physically demanding movie roles.
And his role in Hailee’s life is still changing.
In 2026, Peter became a grandfather for the first time when Hailee and Josh welcomed their baby girl. Peter happily announced his new family title:
“Pop Pop.”
At the same time, he is still doing the job he has done for decades.
Training.
In June 2026, Hailee revealed that she had returned to working out with her father as she gradually rebuilt her fitness routine after pregnancy.
So who is Peter Steinfeld? How did he become a celebrity trainer? Who is his wife, Cheri? Is he related to Jake Steinfeld? And what is he doing now?
Peter Steinfeld Quick Bio
| Detail | Information |
|---|---|
| Full Name | Peter Steinfeld |
| Also Known As | Pete Steinfeld |
| Profession | Personal fitness trainer, fitness entrepreneur |
| Known For | Hailee Steinfeld’s father and trainer |
| Reported Birthday | June 29 |
| Reported Birth Year | 1966, though not strongly verified |
| Age in 2026 | Widely reported as 60 |
| Education | California State University, Northridge |
| Studies | Business and Nutrition |
| Fitness Company | Better Shape-Up |
| Founded Better Shape-Up | 1990 |
| Wife | Cheri Domasin Steinfeld |
| Married | 1992 |
| Children | Griffin and Hailee Steinfeld |
| Famous Brother | Jake Steinfeld |
| Daughter’s Husband | Josh Allen |
| Grandchild | Hailee and Josh’s daughter |
| Grandfather Name | Pop Pop |
| Current Work | Personal fitness training |
| 2026 Update | Training Hailee again after her pregnancy |
Famous Birthdays lists Peter’s birthday as June 29, 1966, which would make him 60 in 2026. Stronger mainstream profiles, however, generally focus on his career rather than publishing a verified birth record, so the exact year is best treated as widely reported rather than certain.
Who Is Peter Steinfeld?
Peter Steinfeld is a longtime personal trainer based in California.
Most people now discover him because of Hailee.
She became famous almost overnight after playing Mattie Ross in True Grit, earning an Academy Award nomination while still a teenager.
Later came:
Pitch Perfect,
The Edge of Seventeen,
Bumblebee,
Dickinson,
Hawkeye,
Sinners,
and her music career.
But behind that very public success was a family that generally stayed much quieter.
Peter was the fitness expert.
Cheri was the interior designer and later played an important management role in Hailee’s career.
And together they raised two children, Griffin and Hailee.
Peter Moved to California in 1978
A profile of Hailee’s parents says Peter moved to California in 1978.
He later attended California State University, Northridge, where he studied business and nutrition.
That combination turned out to suit his future career unusually well.
Nutrition gave him knowledge connected with physical health.
Business helped him eventually build his own company.
Fitness became the bridge between the two.
Peter Built His Career Around Personal Training
Peter entered fitness long before personal training became the huge online industry it is today.
There was no Instagram workout industry.
No TikTok fitness influencers.
No fitness apps on everybody’s phone.
Personal training meant working directly with clients and building a reputation through results.
According to profiles of his career, Peter spent years developing expertise in exercise, nutrition, motivation, and long-term lifestyle change.
That later led him to build his own company.
What Is Better Shape-Up?
Peter founded Better Shape-Up in 1990.
The business focused on personal fitness training, motivation, nutrition, and helping clients develop healthier long-term habits.
A current LinkedIn result continues to associate Peter Steinfeld in Thousand Oaks, California, with Better Shape-Up Inc.
That means the company is not simply an old detail from the 1990s.
It remains closely connected with his professional identity.
Peter Trained Major Celebrities
Peter’s client list became one of the most frequently mentioned parts of his career.
Profiles of his work say he trained stars including:
Madonna,
Glenn Frey,
Ozzy Osbourne,
and Larry David.
Those are very different personalities.
A pop superstar.
An Eagles musician.
A heavy-metal legend.
And one of television’s most famous comedians.
That variety suggests Peter’s job was not simply about creating one identical workout for every client.
Personal training works best when the trainer adapts to the individual.
He Has Also Worked in Fitness Media
Peter’s fitness career extended beyond one-on-one sessions.
An older professional biography says he appeared in fitness-related television and shopping programming and was involved with fitness products and equipment.
He also became involved with BodyMedia’s bodybugg calorie-management technology in the mid-2000s.
That work reflects another part of his career:
he was interested not only in exercise itself but also in tools that helped people monitor activity and nutrition.
Today, wearable fitness trackers seem normal.
Back then, the technology felt much newer.
Is Peter Steinfeld Related to Jake Steinfeld?
Yes.
Fitness personality Jake Steinfeld is Peter’s brother.
Jake is best known for the Body by Jake fitness brand and his long career as a trainer, entrepreneur, actor, and fitness advocate.
IMDb’s biography for Jake directly lists Peter Steinfeld as his sibling and Hailee and Griffin as Jake’s niece and nephew.
So fitness was not just Peter’s individual interest.
It runs through the Steinfeld family.
Jake Steinfeld Became Famous Through Body by Jake
Jake was one of the best-known television fitness personalities of his era.
His Body by Jake name appeared in exercise programs, equipment, television appearances, and fitness businesses.
That environment likely made physical training feel much less unusual as a career choice within the Steinfeld family.
Peter eventually developed his own path with Better Shape-Up rather than simply remaining known as Jake’s brother.
And years later, Peter’s own daughter became the most globally famous Steinfeld of them all.
Is Peter Steinfeld Related to Jerry Seinfeld?
This is a surprisingly common question.
The answer appears to be no known close family relationship.
The names Steinfeld and Seinfeld look similar, which probably explains the confusion.
Hailee’s well-documented famous paternal relative is Jake Steinfeld—not comedian Jerry Seinfeld.
So if you see a website casually connecting Peter to Jerry without evidence, treat that claim cautiously.
Who Is Peter Steinfeld’s Wife?
Peter’s wife is Cheri Domasin Steinfeld.
Cheri has a professional background in interior design and became an important part of Hailee’s early career.
Mainstream profiles identify Peter and Cheri as Hailee and Griffin’s parents and report that the couple married in 1992.
They have now spent more than three decades together.
That long marriage has stretched across enormous changes in their family’s life.
Their children grew up.
Hailee became famous.
Griffin entered racing.
Hailee married Josh Allen.
And in 2026, Peter and Cheri became grandparents.
Peter and Cheri Have Two Children
Their older child is Griffin Steinfeld, born in 1994.
Their younger child is Hailee Steinfeld, born on December 11, 1996.
The siblings took very different career directions.
Hailee went into entertainment.
Griffin became closely involved with cars and racing.
Yet Peter’s influence can be seen in both.
Fitness connects directly with Hailee.
And Peter himself has also been publicly associated with motorsport and racing interests.
Who Is Griffin Steinfeld?
Griffin is Peter and Cheri’s eldest child.
IMDb gives his full name as Griffin Costas Steinfeld and lists his birth date as January 7, 1994, in Los Angeles.
Recent PEOPLE reporting describes Griffin as a professional race car driver.
That makes the Steinfeld family unusually varied.
One daughter became an actress and singer.
One son went racing.
Their father built bodies for a living.
And their mother worked in design.
Peter Supported Hailee Before She Was Famous
Peter’s role in Hailee’s life was never limited to workouts.
He and Cheri supported her when she first began pursuing acting.
Hailee was still a child when she became interested in performing.
She eventually gained small roles and short-film experience before landing the part that changed everything:
Mattie Ross in the Coen brothers’ True Grit.
The performance earned her an Academy Award nomination.
Suddenly, Peter was no longer simply raising a child who wanted to act.
He was raising one of Hollywood’s most talked-about young performers.
Hailee Calls Her Dad Her Trainer
As Hailee’s career expanded, Peter’s professional skills became directly useful.
She has repeatedly trained with him.
A profile of the family quotes Hailee explaining that most of the time Peter is simply her dad and biggest supporter.
But when a tour or demanding project approaches, the relationship changes.
Then she gets “Pete” the trainer.
No excuses.
That is a funny family dynamic.
Imagine your dad telling you to finish another workout.
You cannot exactly fire him and disappear from the family group chat.
Peter Helped Hailee Prepare for Hawkeye
One of their most interesting professional collaborations came before Marvel’s Hawkeye.
Hailee played Kate Bishop, a talented archer who fights beside Jeremy Renner’s Clint Barton.
The role required much more than memorizing dialogue.
There was archery.
Stunt work.
Combat.
Hand-to-hand fighting.
Physical conditioning.
Hailee said that before filming in Atlanta, she trained in Los Angeles with Peter for months.
Their Hawkeye Workouts Changed After Archery Training
Hailee’s preparation became increasingly specific.
Once she began learning archery, Peter helped build exercises around the muscles and movements needed for the role.
They also trained in different styles of fighting and hand-to-hand combat.
That is a useful example of what professional fitness training actually looks like.
Training for an actor is not always simply:
lose weight,
gain muscle,
or run farther.
The exercises may need to support a specific character.
For Kate Bishop, that meant making Hailee’s body capable of repeating demanding action movements safely.
Father and Daughter Have Appeared Together Publicly
Peter has accompanied Hailee to a number of entertainment events.
Photographs show them together at major Hollywood gatherings dating back to her True Grit breakthrough.
One image from 2011 shows Peter with Hailee at a Young Hollywood Awards event.
Another shows father and daughter together at a Netflix premiere.
Peter may not seek entertainment fame himself, but he has clearly been present for many of his daughter’s biggest moments.
Peter and Cheri Attended the Dickinson Premiere
In November 2021, Peter and Cheri joined Hailee for the premiere of Dickinson Season 3.
The family posed together on the red carpet.
That photograph tells the Steinfeld family story nicely.
Hailee in the center as the star.
Cheri beside her.
Peter beside them both.
The parents did not become celebrities in the same way their daughter did.
But they remained visibly part of her support system.
Peter Is Now Josh Allen’s Father-in-Law
Hailee’s family grew again when she began dating Buffalo Bills quarterback Josh Allen in 2023.
The couple later became engaged and married in Santa Barbara on May 31. PEOPLE’s 2026 coverage refers to Josh as Hailee’s husband.
That made one of the NFL’s biggest stars Peter’s son-in-law.
Sports already mattered in the Steinfeld family.
So having an elite professional athlete join it feels strangely appropriate.
Peter Became a Grandfather in 2026
Then came an even bigger family change.
Hailee and Josh welcomed their first child, a daughter, in 2026.
When Hailee announced the baby’s arrival, Peter joined the family’s celebration online.
Cheri announced:
“Cha Cha officially clocked in.”
Griffin became:
“Uncle Griffin.”
And Peter announced his title:
“Pop Pop.”
For a man long known publicly as “Hailee’s dad,” that created an entirely new role.
Hailee’s dad had become Hailee’s baby’s grandfather.
Peter Is Still Training Hailee in 2026
The grandfather story might be sweet.
But Peter’s professional life has not stopped.
In June 2026, Hailee discussed gradually returning to exercise after pregnancy.
And who was training her?
Dad.
She said she was “back with my trainer aka Dad,” adding that he still knows how to make her work hard.
That makes their fitness partnership span several stages of Hailee’s life.
Young actress.
Singer and touring performer.
Marvel action star.
And now new mother.
Post-Pregnancy Training Is Different
Hailee also made clear that she was only gradually increasing her workouts after having her baby.
That distinction matters.
Postpartum fitness is not simply returning immediately to a previous exercise routine.
The body has gone through major changes.
Hailee’s comments suggested a gradual process, with Peter once again helping her structure the work.
It is perhaps the clearest current evidence that Peter remains professionally active in 2026.
Peter’s Age Is Not as Clear as Many Websites Suggest
Famous Birthdays lists Peter as born on June 29, 1966, in New Jersey.
If accurate, he turned 60 in June 2026.
However, stronger family profiles do not usually publish his exact birth date.
For that reason, the responsible wording is:
Peter Steinfeld is widely reported to have been born in 1966 and to be 60 in 2026, but his exact birth details are not strongly verified by major primary or mainstream sources.
That is better than pretending every number repeated online is certain.
Do Not Confuse Him With the Screenwriter Peter Steinfeld
There is another important detail for anyone researching this name.
There are multiple public figures named Peter Steinfeld.
One is the personal trainer who is Hailee Steinfeld’s father.
Another is a screenwriter known for films such as 21, Be Cool, and Drowning Mona.
Some online databases have even mixed details belonging to the two men.
So when researching Hailee’s father, look for:
personal trainer,
Better Shape-Up,
Cheri Steinfeld,
Griffin,
Hailee,
and Jake Steinfeld.
Those details identify the correct Peter.
Did Peter Steinfeld Act?
Some secondary television databases associate the fitness Peter Steinfeld with small acting appearances in earlier decades.
However, the name confusion with screenwriter Peter L. Steinfeld makes those credits difficult to treat casually.
The safest and best-documented description of Hailee’s father remains:
personal fitness trainer and fitness entrepreneur.
That is the career consistently confirmed across mainstream profiles of Hailee and her family.
Where Does Peter Steinfeld Live?
A current LinkedIn search result places the Better Shape-Up Peter Steinfeld in Thousand Oaks, California.
That location also fits the family’s long history.
Hailee was raised in the Thousand Oaks area after spending earlier years in Agoura Hills.
Still, a precise home address is private and unnecessary.
The useful description is that Peter’s professional and family life has long been centered in Southern California.
Peter Steinfeld’s Net Worth
There is no reliable independently verified figure for Peter’s personal net worth.
Celebrity websites may publish estimates.
But those figures usually do not have access to:
his Better Shape-Up business finances,
private training income,
property,
investments,
taxes,
or debts.
Hailee’s wealth is not Peter’s personal net worth.
Josh Allen’s NFL earnings are not Peter’s wealth either.
The accurate answer is therefore:
Peter Steinfeld’s exact net worth is not publicly verified.
Why Peter Steinfeld’s Story Is Interesting
Peter’s biography could easily be reduced to four words:
“Hailee Steinfeld’s father.”
But that misses the timeline.
He had already built a fitness career.
He had already studied nutrition.
He had already started Better Shape-Up.
He had already trained well-known entertainers.
Then his daughter became famous.
And rather than leave his profession behind, Peter’s career became useful inside Hailee’s.
He helped prepare her body for touring.
He helped her train for Marvel action.
And now he is helping her rebuild a fitness routine after becoming a mother.
That is a rare father-daughter professional partnership.
Final Thoughts
Peter Steinfeld was already working in fitness years before anyone knew Hailee Steinfeld’s name.
After moving to California, he studied business and nutrition at California State University, Northridge. He eventually launched Better Shape-Up in 1990 and developed a celebrity client list that included Madonna, Glenn Frey, Ozzy Osbourne, and Larry David.
His family grew alongside the business.
Peter married Cheri Steinfeld in 1992.
They raised two children:
Griffin and Hailee.
Then Hailee’s acting career exploded.
Peter supported her as a father.
But when she needed serious physical preparation, he became her trainer too.
For Hawkeye, that meant months of stunt, combat, and role-specific conditioning.
By 2026, the family had entered yet another era.
Hailee was married to Buffalo Bills quarterback Josh Allen.
Their daughter arrived.
Peter proudly became Pop Pop.
And within months, he was back in trainer mode.
Hailee revealed in June that she had started working with her dad again as she gradually increased her exercise after pregnancy.
That may be the best way to understand Peter Steinfeld.
To the public, he is Hailee’s father.
To his clients, he is a trainer.
To his family, he is a husband, dad, and now grandfather.
And to Hailee?
Depending on the day, he may be supportive Dad—or Pete the trainer who refuses to accept excuses.
Frequently Asked Questions About Peter Steinfeld
Who is Peter Steinfeld?
Peter Steinfeld is an American personal fitness trainer and fitness entrepreneur best known as the father and longtime trainer of actress and singer Hailee Steinfeld.
What does Peter Steinfeld do for a living?
He is a personal trainer and founder of the fitness company Better Shape-Up.
When did Peter Steinfeld start Better Shape-Up?
Profiles of his career say he founded the company in 1990.
Who has Peter Steinfeld trained?
Published profiles list celebrity clients including Madonna, Glenn Frey, Ozzy Osbourne, and Larry David.
Is Peter Steinfeld Hailee Steinfeld’s father?
Yes. Peter and Cheri Steinfeld are Hailee’s parents.
Does Peter Steinfeld train Hailee?
Yes. Hailee has worked with her father for tours and acting roles, including extensive preparation for Hawkeye. In 2026, she returned to training with him after having her first baby.
Who is Peter Steinfeld’s wife?
His wife is Cheri Domasin Steinfeld, who has a background in interior design and played an important role in Hailee’s career.
When did Peter and Cheri Steinfeld marry?
Mainstream profiles report that they married in 1992.
How many children does Peter Steinfeld have?
Peter and Cheri have two children: Griffin Steinfeld and Hailee Steinfeld.
Who is Griffin Steinfeld?
Griffin is Peter’s older child and Hailee’s brother. Recent PEOPLE reporting describes him as a professional race car driver.
Is Jake Steinfeld related to Peter Steinfeld?
Yes. Jake Steinfeld is Peter’s brother and therefore Hailee and Griffin’s uncle.
Is Peter Steinfeld related to Jerry Seinfeld?
There is no reliable evidence of a close family relationship between Peter Steinfeld and Jerry Seinfeld.
Where did Peter Steinfeld go to college?
He studied business and nutrition at California State University, Northridge.
How old is Peter Steinfeld?
Famous Birthdays lists June 29, 1966 as his birth date, which would make him 60 in 2026. The exact date is not strongly confirmed by major mainstream sources.
Is Peter Steinfeld Josh Allen’s father-in-law?
Yes. Hailee Steinfeld is married to Buffalo Bills quarterback Josh Allen, making Peter Josh’s father-in-law.
Is Peter Steinfeld a grandfather?
Yes. Hailee and Josh welcomed their first daughter in 2026.
What does Peter’s granddaughter call him?
Peter publicly chose the grandfather nickname “Pop Pop.”
Did Peter train Hailee for Hawkeye?
Yes. Hailee said she spent months training with him in Los Angeles in preparation for stunt work, combat, and archery-related physical demands.
Is Peter Steinfeld still a personal trainer in 2026?
Yes. Hailee said in June 2026 that she had returned to workouts with her father while gradually rebuilding her fitness routine after pregnancy.
Is Peter Steinfeld the screenwriter of 21?
No. The screenwriter Peter Steinfeld associated with 21, Be Cool, and Drowning Mona is a different person.
What is Peter Steinfeld’s net worth?
His exact personal net worth has not been independently verified, so online estimates should be treated as speculation.
What is Peter Steinfeld doing now in 2026?
Peter remains connected with personal fitness and continues training Hailee. He also entered a new family chapter in 2026 when Hailee and Josh Allen welcomed their first child and Peter became “Pop Pop.”
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