Peter Steinfeld is an American personal trainer, fitness entrepreneur, and the father of actress and singer Hailee Steinfeld. He founded the fitness company Better Shape-Up and has trained clients including Madonna, Glenn Frey, Ozzy Osbourne, and Larry David.
Peter is married to interior designer Cheri Steinfeld. They have two children, Griffin and Hailee. He has also worked directly with Hailee as her trainer, including helping her prepare for her role as Kate Bishop in Hawkeye.
Peter Steinfeld’s Profile Summary
| Detail | Information |
|---|---|
| Full name | Peter Steinfeld |
| Nationality | American |
| Reported birthday | June 29, 1966 |
| Reported birthplace | Passaic, New Jersey |
| Profession | Personal trainer, fitness entrepreneur |
| Education | Business and nutrition at California State University, Northridge |
| Company | Better Shape-Up |
| Brother | Jake Steinfeld |
| Wife | Cheri Steinfeld |
| Marriage date | May 24, 1992 |
| Children | Griffin and Hailee Steinfeld |
| Known for | Fitness career and being Hailee Steinfeld’s father |
| Net worth | Not reliably known |
Peter Steinfeld’s Age and Early Life
Peter Steinfeld is widely reported to have been born on June 29, 1966. If that date is correct, he is 60 years old in 2026.
Passaic, New Jersey, is commonly listed as his birthplace. However, these details mainly come from secondary biography websites and are not confirmed in stronger profiles about his family.
Peter moved to California in 1978.
The names of his parents are not reliably documented in the available information.
His Brother Jake Steinfeld
Peter’s brother is Jake Steinfeld, who also built a career in fitness.
Jake is a fitness personality, entrepreneur, and actor. His work in the fitness industry makes health and exercise a professional interest shared by the brothers.
Peter Steinfeld’s Education
After moving to California, Peter studied business and nutrition at California State University, Northridge.
His education in nutrition later became useful in his work as a professional trainer.
Career as a Personal Trainer
Peter has spent much of his professional life working in fitness.
He became a personal trainer and developed a client list that included several well-known people from entertainment.
Reported clients include:
- Madonna
- Glenn Frey
- Ozzy Osbourne
- Larry David
His work combines exercise, fitness training, and knowledge of nutrition.
Better Shape-Up
Peter founded a fitness training business called Better Shape-Up.
Available information places the start of the business around 1990–1991.
Through Better Shape-Up, Peter developed his professional work as a personal trainer and fitness specialist.
He has also reportedly worked with fitness companies and products during his career.
Other Fitness Work
Information from Peter’s professional background says he has been involved with fitness equipment and consulting.
He reportedly worked with companies including Apex Fitness and BodyMedia and was connected with the bodybugg calorie-management system around 2005.
He has also appeared in fitness-related television and home-shopping programming.
Peter Has Done Some Acting
Fitness is Peter’s main career, but he has also made several small television appearances.
Reported acting credits include:
- Married… with Children
- Happy Days
- Sisters
- Curb Your Enthusiasm
He reportedly appeared in three episodes of Married… with Children.
This acting work should not be confused with the career of screenwriter Peter L. Steinfeld, who is a different person.
Peter Steinfeld Is Not the Screenwriter of 21
Some online biographies incorrectly combine Hailee Steinfeld’s father with another man named Peter L. Steinfeld.
Peter L. Steinfeld is a screenwriter and producer associated with films such as Drowning Mona, Analyze That, Be Cool, and 21.
Hailee’s father is primarily a personal trainer and fitness entrepreneur.
Claims that Hailee’s father wrote 21 or Drowning Mona are based on this identity mix-up.
Peter Steinfeld’s Wife, Cheri
Peter is married to Cheri Steinfeld, also known as Cheri Domasin Steinfeld.
They married on May 24, 1992.
Cheri has worked as an interior designer and as Hailee’s manager.
Before working in interior design, she earned a cosmetology license and worked as a flight attendant.
Cheri has said that she met Peter while working as a flight attendant. After they married, decorating their own home helped develop her interest in interior design.
Peter and Cheri’s Children
Peter and Cheri have two children:
- Griffin Steinfeld
- Hailee Steinfeld
Their first child, Griffin, was born on January 9, 1994.
Hailee followed on December 11, 1996.
Griffin Steinfeld
Griffin Steinfeld is Peter and Cheri’s older child.
He has worked as a race car driver and has also owned a solar panel cleaning business.
Some secondary profiles say Peter shares Griffin’s interest in racing, but Peter’s own competitive racing history is less clearly documented.
Hailee has said that she and Griffin have remained very close as adults.
Who Is Hailee Steinfeld?
Hailee Steinfeld is Peter and Cheri’s daughter.
She is an American actress and singer known for movies and television projects including True Grit, The Edge of Seventeen, Pitch Perfect, Bumblebee, and Marvel’s Hawkeye.
Hailee received an Academy Award nomination for her performance in True Grit.
She became interested in acting and modeling when she was young. Her mother required her to study acting for a year before seriously pursuing it.
Hailee has repeatedly credited her parents and brother for supporting her career.
Peter Has Trained Hailee Steinfeld
Peter has also worked as his daughter’s personal trainer.
Hailee has explained that her father is usually a supporter and cheerleader, but their relationship changes when she asks him to help her prepare professionally.
She has worked with Peter when preparing for tours and specific acting roles.
Training Hailee for Hawkeye
Peter Steinfeld played an important role in Hailee’s physical preparation for Hawkeye.
Hailee played Kate Bishop in the 2021 Marvel series alongside Jeremy Renner.
The role required her to learn archery and prepare for fight and stunt scenes.
Before filming, Hailee trained with Peter in Los Angeles for several months. Their work included different fighting styles, hand-to-hand combat, strength exercises, and fitness circuits.
After Hailee began archery lessons, they also worked on exercises that strengthened the muscles needed for using a bow.
Peter Appeared in the Most Girls Music Video
Peter made a brief appearance in Hailee’s 2017 music video for “Most Girls.”
He appears during a boxing scene, coaching his daughter while she trains.
The appearance connected his real-life fitness career with Hailee’s music work.
Peter Is Still Training Hailee
Peter Steinfeld has continued working with Hailee as a trainer.
In 2026, Hailee discussed returning to workouts with her father after giving birth to her first child.
She again referred to Peter as her trainer while discussing how she was gradually rebuilding her exercise routine.
This shows that Peter remained active in fitness training in 2026.
Peter’s Relationship With Hailee
Hailee has spoken openly about the support she received from Peter, Cheri, and Griffin.
In 2023, she said she would not be the person she is or have the career she has without her family. She also said they made many sacrifices to help her.
Peter has shared his support for Hailee publicly as well.
For her 27th birthday, he posted a message on Instagram expressing pride in the person she had become and saying that one of his proudest things was telling others she was his daughter.
Public Appearances
Peter has accompanied Hailee to several entertainment events.
He attended the 83rd Academy Awards in 2011 with Cheri, Griffin, and Hailee.
He was also photographed with Hailee at The Hollywood Reporter Nominees’ Night in February 2011.
In November 2014, Peter joined her at the premiere of The Homesman during AFI Fest in Hollywood.
Social Media
Peter Steinfeld uses Instagram and has shared family-related posts there.
His posts have included messages about Hailee and her achievements.
His exact social media activity and other accounts are not extensively documented in the available information.
Peter Steinfeld’s Net Worth
Peter Steinfeld’s personal net worth is not reliably known.
Some secondary websites estimate his wealth at around $5 million, but there is no strong financial evidence supporting that amount.
His income from Better Shape-Up and personal training has not been publicly disclosed.
Facts About Peter Steinfeld
- Peter Steinfeld is Hailee Steinfeld’s father.
- He is an American personal trainer and fitness entrepreneur.
- June 29, 1966, is widely reported as his birthday but is not strongly confirmed.
- Passaic, New Jersey, is reported as his birthplace.
- He moved to California in 1978.
- He studied business and nutrition at California State University, Northridge.
- His brother is fitness personality Jake Steinfeld.
- Peter Steinfeld founded Better Shape-Up around 1990–1991.
- His reported clients include Madonna, Glenn Frey, Ozzy Osbourne, and Larry David.
- He married Cheri Steinfeld on May 24, 1992.
- Peter and Cheri have two children, Griffin and Hailee.
- Griffin has worked as a race car driver.
- Peter has helped train Hailee for tours and acting roles.
- He trained her for her role as Kate Bishop in Hawkeye.
- He appeared in Hailee’s “Most Girls” music video.
- He has made small appearances in several television shows.
- Peter was still helping Hailee with fitness training in 2026.
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