Meet the Team


Dr. Tamara Hefferon is a Doctor of Physical Therapy who has a strong passion instilling and empowering others to achieve optimum health, believing strongly in the mantra Exercise is Medicine. She received her undergraduate degree in Psychology from the University of Arizona, with an emphasis in exercise physiology. While in Tucson her love of hiking, biking, and wine was cultivated. Dr. Hefferon completed her doctoral studies at A.T. Still University in Mesa, Arizona and was able to bridge her strong fitness background with excellent manual therapy skills. Her adventurous side was maximized during this time with sky-diving in Eloy, Zip-lining in Costa Rica, drinking Chianti in Italy and getting married to Eric Hefferon!Her emphasis post-graduation has been in 3 main areas: Myofascial and Mobilization with Movement work with patients experiencing injuries from competition of reconstructive surgeries; unique exercise programming for return to sport or return to function; and treatment for persons with early onset and early stage Parkinson’s Disease.

Dr. Hefferon, COO and co-founder of Impact Physical Therapy, also teaches full time in the Doctor of Physical Therapy Program at Franklin Pierce University. Here her emphasis is in the Orthopedic tract of Physical therapy and Parkinson’s Disease. She is blessed to also be a part of the faculty for LSVT BIG in which she travels throughout the world certifying physical and occupational therapists in the remarkable body treatment for patients with Parkinson’s Disease.

Dr. Hefferon has been a featured speaker and guest speaker throughout the Greater Phoenix area including: Power Over Parkinson’s Conference, Davis Phinney Victory Summit, All-Star Conference. Arizona Republic articles include the following topics; Improving the quality of life for women post mastectomy and reconstructive surgery, aquatic therapy, and exercise for those with Parkinson’s Disease. She was featured in Advanced Magazine with an article on Traumatic Brain Injury in young men. Recently she was the primary physical therapist for a regional crossfit competitor managing torn and injured connective tissue throughout his training.

Dr. Hefferon loves life and is constantly on the move, yet her most treasured time of the day is her one on one time with kids Natalie, 2, and Jackson,4, when they read together at night before bed.


Dr. Dave Balzer is a Doctor of Physical Therapy and also a certified strength and conditioning specialist through the NSCA. Dave’s passion is empowering others to fulfill their goals of living a healthy, active lifestyle. He grew up in Morris, Illinois, a small suburb of Chicago, and attended Augustana College in Illinois where he earned his B.S. in Biology. He was a four year student-athlete on the Augustana College baseball team and this experience pushed him toward the physical therapy profession. Dave moved to Arizona where he received his Doctor of Physical Therapy degree from Franklin Pierce University (FPU) in Goodyear where he was lucky to learn from both Dr. Tamara and Eric Hefferon. He had the opportunity to work alongside both as the Graduate Teaching Assistant at FPU.Dr. Balzer’s passion for exercise and health started with his experiences playing baseball, basketball, soccer, and football and this led him to have a special interest in prevention of overuse injuries in youth sports. Dave also enjoys working with the active adult population or those suffering from chronic pain. He has found a specific interest in helping patients who have found little relief from the traditional medical system and loves demonstrating to patients the impact physical therapy can have on returning people to their lives!

Dr. Balzer enjoys anything having to do with the outdoors and athletics. He recently completed a 40 Hikes in 40 Weeks Challenge which expanded his love for Arizona. In his free time, Dave enjoys playing golf, hiking, hunting, camping, and all things St. Louis Cardinal’s baseball or Illinois Fightin’ Illini basketball!


Dr. Sarah Somers is a Doctor of Physical Therapy who has a myriad of passions in the health and wellness world. She received her undergraduate degree in Kinesiology with an emphasis in Exercise Physiology from Arizona State University. A developing athlete still, she has a background in soccer, golf, basketball, and softball, but loves aspects of all sports. This passion for athletics is where her desire to impact others lives developed. She believes in the power of human touch, and her doctorate degree allowed her desire for movement and manual therapy skills to evolve.Dr. Somers’ passion started with the athlete, but has developed an love for children, toddlers and infants. She loves transpiring into a kid and aiding kids and families with proper development. Progressing through childhood as a young athlete is another one of her passions. Defining, developing, and stimulating controlled sport specific training.

With a family connection to Parkinson’s disease, Dr. Somers has become immersed in the community of PD here in the valley. She started with training in LSVT Big, and recently became a Rock Steady Boxing coach. She has been a guest speaker with Power Over Parkinson’s Conference, All-Star Conference, and International Essential Tremor Foundation. She also works closely with local nonprofit organizations planning events to raise awareness for Parkinson’s disease.

She grew up in Pinetop, a small town in northeastern Arizona, where she earned her education and licensing in cosmetology. While attending ASU, she worked as a cosmetologist to pay her way through her college education, and continues to do hair on the side. While impacting people through their image, she also cultivates relationships through movement. She enjoys playing indoor/outdoor soccer, travels around the USA on a kickball team, attends hot yoga and hikes weekly, and love riding bikes.


Dr. Tricia O’Driscoll is originally from Arizona. Dr. Tricia went to undergraduate in South Carolina at Charleston Southern University where she played collegiate volleyball. She then moved back to Arizona and earned her doctorate degree in physical therapy from Franklin Pierce University. She chose PT because she loves helping people get back to what they love to do! Dr. Tricia is married with two dogs, enjoys mountain biking and hiking. We are so excited to have her a part of the Impact family!


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