Our Team

At Physical Medicine of Oklahoma, we help patients reach their healthcare goals by offering total patient care. 


Dr. Brant T. Koenig, DC

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Dr. Brant T. Koenig, D.C. is a graduate of Bishop McGuinness High School, he received his B.S. in Exercise and Fitness Management at the University of Central Oklahoma and earned his Doctorate of Chiropractic from Cleveland Chiropractic College in Kansas City.

Prior to entering Chiropractic School, Dr. Koenig worked for, and managed, the Gold's Gym on Broadway and Memorial Road for 11 years. Besides management duties, Dr. Koenig was a certified personal trainer and nutrition technician, working with clients to attain and maintain their quality of life and fitness goals.

This experience led him to pursue a career in chiropractic, to enable him to continue working with individuals by helping them attain a better quality of life through natural and holistic health care. Dr. Koenig's fitness and athletic background has allowed him to develop a healthcare philosophy of total body health and wellness care. Dr. Koenig's patients are not just treated for back pain or headaches, they receive total health and wellness care, utilizing educational consultations to help enhance all aspects of daily life through healthier living.

His background has given him an opportunity to work with all ages and levels of patients from the new born to the retired farmer, and from the weekend warrior to the elite athlete. He knows all patients have their individual healthcare needs and goals and believes that patients should have options in their health care, and that is how patients are treated at Physical Medicine of Oklahoma. Patients are given their own individualized heath care plans that match their level of needs and commitment to their health.


Zann McMahan, MD

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Board Certified

Dr. McMahan joined Crossway Medical Clinic July, 2016

Medical Education

Doctor of Medicine from the University of Oklahoma College of Medicine Family Medicine Residency at Great Plains Family Medicine

Medical Experience

Prior to joining Crossway Medical Clinic, Dr. McMahan practiced at McMahan Family Medical Clinic in Oklahoma City.

Professional Organizations

American Academy of Family Physicians, American Medical Association, Oklahoma Academy of Family Physicians

Personal Interests

Dr. McMahan and his wife have three children. He enjoys hunting, fishing, and playing acoustic guitar.


Tony Cox

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Dr. Cox graduated Oklahoma State University in 2010. That’s where he first found his passion for helping others. With the sports medicine background, he attended Parker chiropractic college, graduated in 2011. The main focus of Dr. Cox’s treatment is functionality of movement. Dr. Cox is also a certified injectables chiropractor. He is here to help “as many people as (he) can."


Dr. Ryne Shafer, DC

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Dr. Ryne Shafer is a native Oklahoman. Through numerous sports injuries, Dr. Shafer was drawn to alternative and holistic healthcare that delivered quality results as efficiently as possible. He pursued Pre-Med/Psychology at Oklahoma State University before attending Parker Chiropractic College in Dallas.

Upon receiving his Doctorate, Dr. Shafer practiced specialization in Corrective Exercise and Rehabilitation as well as a variety of soft tissue techniques. He followed his passion and landed a position with Airrosti Rehab Centers, a company that specializes in treating a variety of soft tissue injuries and preventing surgery. He now practices FMR, a specialized Functional Muscle Release therapy to speed recovery from injury and correct muscle compensations. He happily resides with his wife in Edmond and plans to make his community a healthier and happier place to live.


Kendra Martin, RN


Jeff Goracke

massage therapist

Support Staff

 Exercise Physiologists