We'd like to introduce the talented people who keep this office running on a day to day basis. From therapists to trainers to office aides, CORE Physical Therapy's employees are all dedicated to helping their customers reach their physical goals.


Matthew Reekstin
Managing Owner

Monica Alvarez
Chief Operations Officer

Physical Therapists & Support

Jennifer Nault PT, MPT

Director of Rehab

Jennifer attended UC Riverside for her undergrad and Cal State Northridge for her Masters in Physical Therapy. She has been a practicing therapist for 12 years, focusing on orthopedics, neurological impairments, sports injuries, post-operative rehab, and complex spine injuries. She is excellent in manual therapy, neuromuscular re-education, and taping techniques. Dedicated and enthusiastic, with a reputation for innovative evidence-based treatments, outstanding one-on-one care, and consistent patient satisfaction. Jennifer serves as an APTA credentialed clinical instructor


Jennifer became interested in physical therapy in high school after watching many injured soccer teammates go through rehab. "My favorite part of the profession is watching the progress and seeing patients gain their function and confidence back. 

When I’m not working, I enjoy spending time with my kids at the beach, photography, snowboarding, and wake boarding.  I’m an animal lover and have fostered many shelter dogs over the years. My other hobbies include drawing, watching basketball, and binge-watching Grey’s Anatomy. 

I have additional experience in balance rehab and team strength and conditioning.

Her dedication and excellent service to our patients and staff leave no doubt as to why Jennifer is our CORE Physical Therapy Director of Rehabilitation.

Kevin Pham PT, MPT

Director of Student Education

As an Orange County native, Dr. Kevin Pham played sports at San Clemente High School before earning his BS in Kinesiology at Cal State Fullerton and then his Doctorate of Physical Therapy at Western University of Health Sciences.  As a Doctor of Physical therapy, he is dedicated to providing patients excellent care with his hands-on approach. Dr. Pham is not only an APTA credentialed clinical instructor but serves as the Director of Student Education overseeing the entire program, approving students who come to our facilities, and implements the policies and procedures followed.


As Director of Student Education, he has overseen the growth of CORE Physical Therapy's student program into one of the premier clinical rotation sites in Southern California and has forged strong partnerships with the Doctor of Physical Therapy Programs at universities in Southern California and out of state.  



3x  CORE PT Top Performer of the Year

APTA Certified Clinical Instructor

Fluent in Vietnamese

Director of Fitness

Krista Contreras PT, DPT

Director of Continued Education

Dr. Contreras is a board-certified, licensed Doctor of Physical Therapy. She graduated from the University of Southern California in 2016 where she earned her Doctorate in Physical Therapy. She completed her last clinical rotation at CORE Physical Therapy in 2015, and joined the CORE team shortly after graduation in.. 


Dr. Contreras was born and raised locally. She attended Rosary High School in Fullerton, where she played tennis and softball. She then started on her pursuit of a career in Physical Therapy, a lifelong dream of hers, by earning her bachelor’s degree at Loyola Marymount University. 


Dr. Contreras has special interests in treating diagnoses including neurological disorders such as stroke (CVA) and Parkinson’s disease, balance and gait disorders, disorders of the TMJ, head and neck pain, and sacroiliac joint dysfunction. Dr. Contreras enjoys working with patients that span the lifespan including pediatric patients, young athletes, and geriatric patients. 


When she is not treating patients at CORE, Dr. Contreras enjoys swimming, biking, watching Angels baseball games, and going to theme parks with her husband and daughter.


She is passionate about the education of future Physical Therapists and serves as an APTA credentialed clinical instructor. Dr. Contreras has firm beliefs in the value of evidence-based physical therapy treatment and strives to provide exceptional care to all of her patients. 

Carey Laurent PT, DPT

Health & Safety Director

Dr. Laurent was born and raised in La Habra, CA with two older sisters, an older brother, and two loving parents. From a young age, he played any and all sports and took a liking to basketball and soccer most. He attended Servite High School in Anaheim, CA where he played basketball for 4 years and lacrosse for 1 year. He went on to graduate from UC Santa Cruz, home of the Banana Slugs, with a BS in Health Sciences.

It was during his undergraduate years he found that physical therapy was his calling. After undergraduate studies, he decided to move to the south for 3 years and attend the Doctor of Physical Therapy school at Western Kentucky University, where he was class treasurer in charge of fundraisers. Dr. Laurent has been working at CORE PT since September 2018 and enjoying every minute of it.

Dr. Laurent enjoys treating in the outpatient setting, especially with orthopedic injuries, and he gets ultimate satisfaction when his patients leave on the last day of PT pain-free and returning to what they love doing most. Dr. Laurent serves as an APTA credentialed clinical instructor here at CORE Physical Therapy

Over the years he has increased his grasp on the Spanish language and is now independent when working with Spanish-speakers here in the clinic. During his free time, Dr. Laurent enjoys doing anything outdoors, whether this is shooting hoops, going to the beach, kayaking, going on hikes, or traveling.


Diane Kahler PT, DPT

Dr. Kahler was born and raised in Orange County. She received her Bachelor's Degree in Kinesiology from Sonoma State University in December of 2010 and her Doctorate from Azusa Pacific University in December 2015. Dr. Kahler serves as an APTA credentialed clinical instructor for Physical Therapy schools sending their doctorate students to our clinics.


Diane is an avid Disney fan and loves SCI-Fi/Fantasy novels. She also enjoys her new role as an auntie.

Ashley Comeford PT, DPT

Ashley graduated from the University of California, Los Angeles in 2011, and then attended the Western University of Health Sciences, where she received her Doctorate in Physical Therapy in 2016.

Dr. Comeford enjoys treating patients of various conditions and injuries including lumbar and cervical injuries, shoulder and hand conditions, hip, knee, ankle injuries, rotator cuff repair, carpal tunnel release, and CVA, just to name a few. She also enjoys going to Disneyland whenever she is able.

She is an APTA credentialed clinical instructor and is certified in Rocktape Performance Movement Techniques

Ming Chiu PT, DPT

Dr. Chiu received his Doctorate of Physical Therapy from Loma Linda University. He has been a practicing doctor of physical therapy for over 15 years. His philosophy is to provide patients with individualized treatments to their specific needs by incorporating proper body mechanics and specific tasks allowing patients to have a better quality of life. Dr. Chiu is an APTA credentialed clinical instructor helping physical therapists of the future.


Throughout his career, he has worked with patients from athletes to geriatrics and has some extensive experience with hand therapy as well. Dr. Chiu's free time is spent volunteering as an umpire for a Little League Baseball Organization that teaches children life lessons and builds a stronger community.

Matthew Berry, PT, DPT

Matt is from San Bernardino, CA, and attended Packinghouse Christian Academy where he graduated in 2009. He graduated with distinction from Southern Nazarene University in 2014 with his Bachelor of Science in Kinesiology. Matt received his Doctor of Physical Therapy degree from the University of Oklahoma Health Sciences Center in May of 2017.

During physical therapy school, Matt completed clinical internships in Scottsdale, AZ, and the OKC metro area. These experiences provided an excellent background in orthopedics and allowed him to work with patients with a wide variety of diagnoses and explore several treatment methods. Dr. Berry also serves as an APTA credentialed clinical instructor for our doctorate students affiliated with our facilities.

Following graduation, Matt worked in Oklahoma City, OK for 2 years before moving to the Temecula area. His areas of interest include manual therapy, evaluation/treatment of general orthopedic conditions, prevention and rehabilitation of sports injuries, and spinal dysfunction.

Outside of the clinic, Matt enjoys traveling, hiking, golfing, and spending time with his wife.

Rachel Kim PT, DPT

Rachel graduated with her Bachelor's degree from California State University, Long Beach, and went on to obtain her Doctorate degree in Physical Therapy from Azusa Pacific University in December 2019.


Rachel is not only a skilled physical therapist, but she is also fluent in Korean and is very helpful in making this population of our clinic feels at ease with their care.

Andrew Stenson, PTA

Andrew attended California State University, San Marcos for his undergrad and graduation from San Diego Mesa College with his PTA in 2017. He worked as an athletic trainer with Murrieta Valley High School, where he spent years as a physical therapy aide.

Andrew was a baseball head and assistant coach for kids ages 13 and under. Andrew's most memorable moment was working as an aide with the San Diego Padres physical therapist. Andrew looks forward to implementing the knowledge he has gained through these various experiences to help patients navigate through the rehabilitation and aging process.

Brandon Bristol, PTA

Brandon graduated from American Career College and became a licensed PTA  in September of 2019 and joined CORE Physical Therapy in December of the same year.


Brandon is an avid mountain biker and enjoys an active outdoor lifestyle. My wife and I love hiking, camping, scuba diving, traveling, and just about any outdoor adventure we can get ourselves into. As a lifelong athlete with an extensive background in motorcycle racing, I've had my fair share of injuries and can relate to many of the patients I treat on a daily basis. I sincerely enjoy helping my patients reach their rehabilitation goals.  

Marcus Heisner, ATC

Marcus grew up in Santa Ana, CA and obtained his Bachelor's Degree from Point Loma Nazarene University in Athletic Training. He played 4 years of collegiate baseball, winning a Gold Glove at second base. Marcus is the clinics' Certified Athletic Trainer, and is currently contracted to Fullerton High School as their Head Athletic Trainer. Marcus is currently in pursuit of a Master's Degree in Kinesiology from California Baptist University. Outside the clinic, Marcus continues to pursue his love for athletics as a weekend warrior, playing baseball and hockey.

Christian Trigueros, CMT

Christian graduated from Everest College in Alhambra, CA in 2014 as a Certified Massage Therapist. Since then, he's worked alongside physical therapists in out-patient orthopedic clinics and has focused on therapeutic massage to help patients to the best of his ability.  Sports, Deep Tissue, Relaxation and Pregnancy massage are just some of his specialties. He has a sincere passion to want to help people and make a difference. Patients and clients who suffer from pain in their shoulders, neck or back praise his skills. Along with patients suffering from Parkinson's Disease, Adhesive Capsulitis, and Sciatica, just to name a few. 


Chris loves music. He plays bass on the Praise and Worship team at the church he attends, where he has also volunteered as a music teacher for children and teenagers. He enjoys swimming, traveling, and watching live musical performances with his wife.


Chris is fluent in Spanish and is certified in Rock Tape Kinesiology Taping.


Luis “Artie” Hernandez, BS

Clinical Aide Supervisor – Fullerton

Jon Arroyave, BS

Clinical Aide


Kyra Sigmon, BS

Clinical Aide

Adolfo Hernandez, BA

Clinical Aide

Jacob Brink, BS

Clinical Aide

Frank Lopez, BS

Clinical Aide

Ryan Aguilar, BS

Clinical Aide

Kami Powers
Clinical Aide

Abigail Tapia
Clinical Aide

AJ Nelson, BS
Clinical Aide


Jessica Negrete

Front Office Supervisor

Marina Archuleta

Patient Service Coordinator

Fanny Lezama

Medical Administrative Specialist

Christina Hernandez

Medical Administrative Specialist

Monica Johnson, B.A.

Medical Administrative Assistant

Sammy San Elias

Medical Administrative Assistant

Jackie Martinez

Medical Administrative Assistant


Tiffany Arciga

Medical Administrative Assistant

Wellness Center

Jon Arroyave, BS

Fitness Trainer – Orange

Adolfo Hernandez, BA

Fitness Trainer - Orange

Kyra Sigmon, BS

Fitness Trainer - Temecula

Frank Lopez, BS

Fitness Trainer - Fullerton

Christian Trigueros, CMT

Certified Massage Therapist

Marketing / Affiliates / Billing

Kellie Redding

Executive Assistant
Benefits and Payroll

Carol Reekstin


Provider Relations

Billing Inquiries:

Professional Medical Billing Systems

Affiliates: Joo Won (Paul) Kim, L.Ac, MSOM

Acupuncturist- Fullerton

Anaheim Hills

120 S. Chaparral Ct., Suite 150

Anaheim, CA 92808

Phone: 714-998-9580

Fax: 714-998-9581

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1027 N. Harbor Blvd., Suite B

Fullerton, CA 92832

Phone: 714-870-U4PT (8478)

Fax: 714-870-8405

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1026 E. Chapman Avenue, Suite C

Orange, CA 92866

Phone: 714-538-1952

Fax: 714-538-1490

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41278 Margarita Road, Suite 102

Temecula, CA 92591

Phone: 951-587-8105

Fax: 951-587-8405

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