Mark Leenheer graduated from Saint Louis University in 2015 with a Doctorate in Physical Therapy. Following graduation, Mark completed a post-doctoral residency program with a focus in Orthopaedic Physical Therapy at the Cleveland VA Medical Center. He then went on to complete his Fellowship in Orthopaedic Manipulative Therapy through the North American Institute of Orthopaedic Manual Therapy. He holds additional certifications in dry needling as well as instrument-assisted soft tissue mobilization. Mark's treatment approach focuses on identifying the root cause of symptoms and includes joint manipulation, neuromuscular re-education, exercise utilization, stretching, and dry needling. Mark believes strongly in patient education and ensures an understanding of pathology, anatomy, and treatment approach is explained to each patient in order to include them in the treatment process. Mark is a Cleveland, OH native and a passionate Cleveland sports fanatic. In his free time, Mark enjoys spending his time with his family. He is an avid cyclist, skier, and trail runner.

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Charlie Stine is a licensed Physical Therapist Assistant who graduated from Community College of the Air Force in 1990 with his Associate of Applied Science degree in Physical Therapy Assisting. After retiring from the United States Air Force, Charlie served the civilian sector in various leadership roles such as Rehab Director, Ortho-Spine Service line Director and Chief Operating Officer.  His desire to return to direct patient care has led him to Action Potential. Charlie's passions are relationship building and helping people return to a functional lifestyle. He enjoys the fast-paced environment of outpatient functional rehab. Outside of work, Charlie enjoys golf, fishing, Penn State Football and Wrestling, and spending time with his family. 

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Mark has been a physical therapist for 41 years, with an education that includes a Ph.D. in Pathokinesiology and Biomechanics. He is a certified manual therapist (Cyriax), a strength and conditioning specialist (NSCA), a certified Level 1 speed, agility and conditioning coach, a certified Level 3 medical professional (TPI), a certified Functional Movement Screen Clinician (FMS), and a certified FDN clinician.

Mark has been active in sports his entire life. In high school and college, he participated in soccer, swimming, rugby, crew and golf. He then became a marathon runner and triathlete. He coached high school girls’ soccer for 10 years. Now, Mark enjoys spending time with his family, weight training and hiking.

Mark is a member of the American Physical Therapy Association, National Strength & Conditioning Association and Performance Dynamics. He continually attends advanced courses to stay current on the most cutting-edge treatment methods.

He has combined his passion for athletics and intensive training in spine and sports rehabilitation to deliver quality care to his patients to meet their rehabilitation needs and assist them in getting back to life.

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Justin Lane, PTA, is a Physical Therapist Assistant specializing in orthopedics, sports rehabilitation, fall risk prevention, pediatric orthopedics, and vestibular therapy. He earned his Physical Therapist Assistant degree from South University in Wellington, Florida, and has been practicing since 2018.

Originally from Florida, Justin relocated to Colorado in 2023 and brings a well-rounded, patient-centered approach to care. He is passionate about helping patients improve mobility, reduce pain, and return to the activities they enjoy through individualized, evidence-based treatment.

Outside of the clinic, Justin enjoys golfing, wakeboarding, hiking, and snowboarding. He also values spending quality time with his wife, Jessica, and their two daughters, Everly and Brynlee.

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