Our Team


Owner, Physical Therapist

Dr. Jones earned his doctorate degree from the University of Indianapolis in 2006, and had a vision for a unique private practice from the beginning. The culmination of many years of research and experience led him to co-found Active Physical Therapy in Columbus, OH. He is currently leading the Active at Work program, assisting employers in managing injured employees and mitigating costs associated with occupational injuries. His research interests lie in the effects of psychosocial and fear-avoidance on chronic pain and disability.


In his free-time, Dr. Jones enjoys spending time with his wife and chasing around his two sons and daughter.


Email Kevin at kjones@activeptcolumbus.com

Mandi Vonderhaar

Owner, Physical Therapist

While pursuing a degree in Exercise Science at the University of Dayton, Mandi started her career by helping people reach their goals as a personal trainer and group fitness instructor. She continued her studies at the University of Dayton in Physical Therapy school with research endeavors focused on treatment interventions for the hypermobile patient population and vestibular rehabilitation. During physical therapy school, Mandi also traveled to China to experience Eastern Medicine at Nanjing Medical University. She graduated with her Doctorate in Physical Therapy in 2011.


After working in several different orthopedic clinics across the country as a traveling physical therapist for two years, Mandi sought a long-term position in a clinic that encompassed a model of true healthcare – one that valued and empowered patients, while also providing the highest level of evidence-based care. She found that at Active!


Mandi has been at Active since 2013. She specializes in treatment of the spine, jaw, and vestibular dysfunctions, has advanced training in trigger point dry needling and manual therapy techniques including joint manipulation, mobilization, and muscle energy. Mandi also serves as the Vice Chair for the Ohio Physical Therapy Association’s Central District and is a Certified Clinical Instructor for doctor of physical therapy students.


Mandi treats patients at the Hilliard clinic and hosts a monthly group class for those suffering from Ehler’s Danlos Syndrome (extreme joint hypermobility). She also treats at CrossFit Grandview, helping Games athlete’s and weekend warriors.


Mandi is originally from Akron, Ohio, but now resides in Clintonville with her husband, Doug and their dog, Griffey. She enjoys being ACTIVE – hiking, yogaing, traveling, CrossFitting, and empowering her patients to be ACTIVE too!


Email Mandi at mvonderhaar@activeptcolumbus.com


Physical Therapist

John received his Doctor of Physical Therapy degree from the University of Pittsburgh in 2014. Prior to beginning graduate school, he earned his Bachelor of Science in Applied Sciences degree from Youngstown State University where he studied Exercise Science and played ACHA Division 1 Ice Hockey.


In order to further himself as a clinician, he has also obtained board certification as an Orthopaedic Clinical Specialist and is a Certified Strength & Conditioning Specialist. His treatment philosophy involves evaluating each person and injury as a unique experience and identifying ways to use movement and exercise to meet each patient’s goals.


During his career, John has worked primarily in the outpatient private practice setting and specializes in the treatment of an athletic population with emphasis on hip pathology and the management of the ice hockey athlete. Due to these interests, he has developed and teaches courses nationally specific to these two topics in order to improve appropriate conservative and post-operative management of The Athlete’s Hip and The Ice Hockey Athlete.


John is originally from Powell, Ohio and currently lives in Columbus with his wife and two furry children. He grew up playing hockey in the CCYHA, EYHA, and Jr. Blue Jackets organizations and is still active in the hockey community.


Email John at jsnyder@activeptcolumbus.com


Physical Therapist

Dr. Betts is a Physical Therapist who specializes in treating the active population and athletes of all ages and levels.  She truly enjoys sharing the benefits of physical therapy with all her clients.  Her goal is to get people out of pain and giving her clients intrinsic control over their symptoms.


With her first career in personal training and coaching; Mattie has combined her knowledge of exercise/fitness and sport with physical therapy to successfully treat the active population.  She is now effectively coming along side her clients to coach them through their injuries or setbacks while keeping them as active and strong as possible while rehabbing them at the same time.  She is knowledgeable in programming around an injury, and personally guides her clients to maximize any required down time.


Her treatment method incorporates manual procedures, that lead to better mobility and muscle function.  Mobility drills that directly correlate with the specific movements that are specific to her client’s daily function and sport.  Lastly, and most importantly she systematically uses exercise and movement to provide true healing to injury.


Specialties: Post-operative care of orthopeadic surgeries, degenerative joint and disc disease of the spine, shoulder pain, knee pain, ankle/foot pain, Cross Fitters, Olympic weight lifters, power lifters, runners, yogis, and young athletes: middle school-collegiate.


Inspiration while rehabbing:  RUN when you can.  WALK when you have to.  CRAWL if you must.  Just NEVER give up.


Email Mattie at mbetts@activeptcolumbus.com

Jake Pfleghaar

Physical Therapist

Dr. Jake earned his Doctor of Physical Therapy degree from Marshall University in Huntington, West Virginia in 2019. As a part of his clinical education, he completed an internship with the United States Air Force at Keesler Airforce base in Biloxi, Mississippi. While there, he was able to treat high level military special forces, security officers and other active duty personnel. Jake completed his undergraduate work at The Ohio State University and studied health sciences.


Jake has spent most of his life playing sports and still enjoys playing pick-up basketball games, golfing and lifting weights. With Jake’s experiences as an athlete, he believes in addressing the root cause, but in the meantime finding a modification to keep you doing the activities you love to do.


Jake strives to empower his patients to be the driving force behind the rehab process. He aims to use guided exercises and progressive loading to facilitate independence on the journey to getting back to the activities you love. Jake believes in using the treatment approaches that are best supported by current research. Jake always aims to create a positive growth mindset as the brain plays a major role in all of life’s experiences.


Jake is originally from Perrysburg, Ohio and now lives in Columbus. Jake enjoys being outdoors, cooking, exercising and watching sports on TV.


Email Jake at jpfleghaar@activeptcolumbus.com

Jenna Remy

Physical Therapist

Bio coming soon!



Email Jenna at jremy@activeptcolumbus.com

Jenna Naber

Physical Therapist

During her studies at the University of Dayton, Jenna worked with a wide variety of patients in various settings. She completed rotations in acute care, inpatient neuro rehab and outpatient sports and orthopedics; working with high school athletes, military veterans, and even Olympians. While finishing up her studies, Jenna traveled to Singapore to complete an independent study capstone in Traditional Chinese Medicine at a modernized clinic. She graduated with her Doctorate in Physical Therapy in May of 2019.


Jenna has been a CrossFit athlete since April 2017 and has a strong passion in combining physical therapy with her love of CrossFit. Her goals to accomplish this include working on and off the clock in research, training, and education in any way she can. Jenna values each patient as an individual and is determined to provide each client with the best evidence-based care.


Some challenges Jenna is excited to take on are gaining more hours as a licensed clinician, developing herself as an all-around athlete, and working towards increasing her education; including dry needling and CSCS. A few of Jenna’s strengths highlighted by her previous supervisors include: determined and self-disciplined, focused on individual patient care, strong communication with patient and colleagues, and easily builds trust-based relationships with patients.


Jenna will be treating patients at the Newport, KY clinic located inside NewCov CrossFit; a quick drive for anyone located within the tristate.


Jenna is from the east side of Cincinnati, but currently resides on the west side of Cincinnati with her significant other, Patrick and their dog, Gunner. She loves to be ACTIVE – strength training, CrossFitting, hiking, traveling, and is open to trying all types of workouts.


Email Jenna at jnaber@activeptcolumbus.com


Office Manager / Licensed Massage Therapist (LMT)

Kat is a Licensed Massage Therapist and Active PT’s Office Manager. When Kat started working for Active Physical Therapy in 2012, she developed a passion for helping people after really diving deep into the flawed health care system after graduating with a Bachelors degree in Exercise Science. She saw how many health care clinics view patients as a number rather than a real person with real goals, and since then has been on a mission to make Active PT a clinic like none other!


Kat thrives on celebrating the success of Active PT’s patients and being an advocate for them in every step of the process. From the first phone call to wrestling with insurance companies if need be, Kat is passionate about doing the heavy lifting so that the patient doesn’t have to.


In her free time, Kat enjoys hiking, running, lifting, going to the Potters House church and calligraphy! Kat lives in Hilliard with her husband and son.

Email Kat at kprater@activeptcolumbus.com



Patient Care Specialist

Meg Kemerer received an associates degree in Medical Administration in 2009. Prior to joining the Active PT team, she worked as an office manager at an educational learning center for kids. Meg is a former patient and currently trains at Crossfit Grandview. When she’s not at Active PT or Crossfit, you can find her spending time with her nieces and nephew (7, 4, & 2) or exploring Columbus with friends.


Meg joined Active PT in April 2018 and is excited to enhance the office experience for our wonderful patients!

Email Meg at mkemerer@activeptcolumbus.com 

Danielle Franklin

Licensed Massage Therapist (LMT)/Patient Care Specialist

Danielle received her Massage Therapy License after attending Columbus State Community College. She found love for the healing power of touch after witnessing its effects on her loved ones. As a new member of the Active team, Danielle is excited to work alongside experienced physical therapists while applying techniques to relieve pain and encourage relaxation. She also assists the office team to ensure that patients have a positive experience from day one to the end!

When she isn’t studying new ways to address tight muscles, she enjoys traveling, ministry and dancing!

Email Danielle at dfranklin@activeptcolumbus.com 

paige mcmahan

Patient Care Specialist

Paige joined the Active PT team in November of 2018 to manage the front office of our Worthington location and assist Dr. Mattie with her patients and their exercises in the clinic. Prior to working with Active PT Paige received her bachelor’s degree in Health and Exercise Science from Colorado State University in 2014. She spent three years as the Assistant Swim and Dive coach for Colorado State University – Pueblo. Paige then decided to continue her education and in 2017 she moved to Columbus to go to the Ohio State University. In May of 2019 she graduated with a Master’s in Sports Coaching.


When she’s not at Active PT, Paige likes doing CrossFit, reading, relaxing at home, hanging out with friends, and trying out new and fun fitness activities.


Paige loves creating a family friendly atmosphere at Active PT Worthington and helping our patients from the first call to the last exercise.


Email Paige at pmcmahan@activeptcolumbus.com



Amy graduated with a B.S. in Medical Dietetics from the Ohio State University in 1992, and has had the opportunity to work in a variety of settings including hospitals, long term care facilities, physician offices, diabetes clinics, community settings as well as with the media.


Amy joined the Active Physical Therapy team in 2012. She currently provides outpatient nutrition counseling to individuals with a variety of diagnoses and nutritional goals. In 2014, she added food sensitivity testing and treatment to her practice. Amy is a Certified LEAP Therapist (CLT) and has additional training in the testing and treatment of food sensitivities using the patented Mediator Release Test (MRT). The MRT measures your body’s immune reaction to 170 different foods and chemicals. Food sensitivity is often the root cause of many inflammatory conditions. Patients suffering from migraine, fibromyalgia, IBS, Crohn’s UC and other inflammatory conditions can find significant relief by discovering their “best” foods and implementing an anti-inflammatory diet specific to their individual results.


Amy is passionate about helping her patients feel their best.  She enjoys guiding them into making food choices that benefit their health while taking into consideration their individual needs and preferences. Amy and her husband Matt have a teenage daughter and son. She spends her free time with her family and enjoys reading and furthering her knowledge in the areas of integrative nutrition and health.


Clinic Therapy Dog and Door Greeter

Griffey started working at Active Physical Therapy in 2016. Griffey takes his job very seriously being the door greeter, unless he had a big morning and needs a nap. He loves interacting with all of Active Physical Therapy’s patients and enhancing their patient experience.


In Griffey’s free time, he likes following his human, Mandi, and taking naps.