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Meet Our Staff

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John J. Rush, MD, FACEP, MBA, MHA
President, Cenegenics Global Health

Dr. Rush attained a Bachelor’s of Science degree in Integrated Life Sciences from Kent State University (Kent, Ohio), and then earned his medical degree from Northeastern Ohio Universities College of Medicine (Rootstown, Ohio). He went on to complete an emergency medicine internship and residency at Loma Linda University (Loma Linda, California) and became board certified by the American Board of Emergency Medicine. Dr. Rush also graduated from Pfeiffer University (Charlotte, North Carolina), completing an executive MBA/MHA program. He has completed physician training & certification in Age Management Medicine, jointly sponsored by The Cenegenics Education and Research Foundation (CERF) and the Foundation for Care Management (FCM).
His medical executive positions have included Chief Financial Officer at Wake Emergency Physicians, Vice President of Medical Affairs at Coastal Physician Services (NYSE: DR), Medical Director at CIGNA Healthcare (NYSE: CI), Senior Vice President of Health Services at PacificCare Health Systems (NYSE: PHS), and Chief Medical Officer at Hanger Orthopedic Group, Inc. (NYSE: HGR).
Most recently, Dr. Rush opened the Cenegenics Medical Institute of Washington, D.C. where he is the President. Dr. Rush has a passion for medical paradigms that create superior patient care and offer the best hope for optimized health. He lectures and uses social media extensively to extol the virtues of health and wellness; he practices what he preaches.

John Kocka

Dr. John Kocka, Cenegenics DC Physician

Dr. Kocka is physician certified by the Cenegenics Medical Institute and has been with Cenegenics since 2011.  Dr. Kocka trained at the Cleveland Clinic where he completed residency in Family Medicine with specialization in preventive medicine and sports medicine. Prior to founding Premier Health Clinic, a family practice, sports medicine & wellness clinic, he was the Medical Director at the Twinsburg Urgent Care and Twinsburg Wellness Center. He previously served as the Medical Director of the NASA Glenn Medical clinic and Fitness Center.  
Currently, he is the medical supervisor of Brecksville Physical & Sports Medicine.  In addition to his Board Certification in Family Medicine, Dr. Kocka is board certified in Age Management from the American Academy of Anti-Aging, Age Management Medical Group and Cenegenics Medical Institute.  He has extensive training in hormone replacement therapy, medical nutrition, exercise physiology and has treated over 2,000 patients in age management/preventive medicine.  
Dr. Kocka is a member of the International Hormone Society, International Society For the Study of the Aging Male, American Academy of Family Medicine and American College of Sports Medicine. He is also a Major in the Air Force reserve, serving as a physician with the 910th medical squadron.  
Dr. Kocka offers unique knowledge and experience outside his physician experience. With his interest in combat sports, he has been a ringside doctor for the Ohio State Athletic Commission including physician for the Ultimate Fighting Championship. He has won multiple natural bodybuilding and martial arts competitions and is a former coach at Strong Style Mixed Martial Arts. Though he has stopped competing, his passion and commitment to weight training, functional training, exercise, nutrition, and health remains; serving as an example to his patients. Dr. Kocka believes in practicing the medicine and lifestyle he preaches to his patients.


Tiffany Harlan, B.S., Nutrition and Exercise Counselor, Cenegenics DC

Tiffany Harlan is the Nutrition and Exercise Counselor for Cenegenics DC and brings over 10 years of experience in the fields of preventative health, fitness, aging, and advanced diagnostic testing. Additionally, Tiffany service as the Chief Exercise Physiologist for Composition ID, specializing in performance testing, exercise and nutrition assessment. Alongside her work at Composition ID, Tiffany serves as a Fitness Director for WTS International.
She is passionate about providing access to advanced testing and health modalities that help her clients achieve optimal health, wellness and happiness. She holds a degree in Kinesiology from the University of Maryland and now calls Maryland home. She is the proud mother of three girls.


Krishanna Coleman-LeSane, M.A., Office Manager, Cenegenics DC

Krishanna Coleman-LeSane, M.A. is the Office Manager for Cenegenics DC and has served in this capacity for three years. She has worked alongside many physicians at Cenegenics DC since its inception in February 2010. Krishanna holds a Bachelor of Arts in Political Science and Sociology from Howard University as well as a Master of Arts in International Security Studies from Trinity Washington University. She is currently seeking her Ed.S. from Liberty University with an anticipated completion date of May 2017.
Krishanna is a member of several organizations to include, the American Political Science Association, Pi Sigma Alpha Political Science Honor Society, Tau Beta Sigma National Honorary Band Sorority Incorporated and the Stafford Fredericksburg Section of the National Council of Negro Women, where she serves as the Youth Section Leader.
Krishanna believes in Cenegenics and what the practice preaches to its patients. She is a proud Army wife and mother of one, a girl, named Kayla. She currently resides in Fredericksburg, Virginia.