Tampa Location
Bartley Harvard Kerr, DC, Founder of NRC and CEO
Dr. Kerr has been in practice since 1998 and has helped thousands of patients and is committed to the best possible care for them. Dr. Kerr received his bachelor’s degree from the University of South Florida and his D.C. degree from Logan University in St. Louis, Missouri. Since starting his practice, Dr. Kerr has continued his education by keeping current and up to date with the latest research and techniques in hormone therapy, nutrition, exercise, and genetics. In addition, he has worked with some of the top minds in these fields to help him formulate specific, personalized treatment plans for his patients. He wrote the best selling book "Rejuvenation" to relate these concepts to both physicians and the general public alike. Dr. Kerr is currently or has been an active member of the following organizations:
John DeCosmo, D.O. Medical Director
Dr. Decosmo has been in practice in the state of Florida since 1988. He received his D.O. Degree from NOVA-Southeastern University and performed his internship at Metropolitan General Hospital. He later achieved faculty appointments of Adjunct Clinical Professor at NOVA-Southeastern University as well as Kansas City University of Medicine and Biosciences, Kirksville College of Osteopathic Medicine, and Lake Erie College of Osteopathic Medicine. Dr. DeCosmo has the following appointments and affiliations:
Rhonda, Director of Patient Care and Relations, N.C.M.A.
Rhonda is our director of patient care and relations, and is a Nationally Certified Medical Assistant with experience in medical care. Rhonda liaises with pharmacies for management of patient’s medication and has extensive experience in coordinating with laboratories for patients’ diagnostic needs. She coordinates with patients from the initial visit, through the diagnostics, and will administer patients’ injection. She is a graduate of Career Institute of Florida with high honors and completed her externship with NRC. St. Louis Location
Michael Wittmer DC, Clinical Director
Dr. Wittmer has been in practice since 1980 after receiving his D.C. degree from Logan University in St. Louis, Missouri. Dr. Wittmer has also been a faculty member at Logan University since 1984 until present day along with serving as Chief of Staff from 2010-2015, educating thousands of physicians around the country. He is also a certified USA Weightlifting coach and served as a valued member of the USA Weightlifting Board of Directors. Since starting his practice, Dr. Wittmer, has helped thousands of patients and is committed to the best possible care for them. Dr. Wittmer has lead and assisted with continuing education seminars for Doctors of Chiropractors, athletic trainers, along with personal trainers. 
Courtney Layton – Office Manager
Courtney is not only a Medical Assistant, but your liason to NRC in St. Louis. She began her career in public health before moving on to Internal Medicine, Dermatology, and Integrative medicine. For the last 3 years, Courtney has been working both in front and behind the scenes with medical office, an internal medicine practice that specialized in thyroid disease and hormone replacement therapy. Courtney enjoys watching people regain their quality of life after starting on bio identical hormone replacement therapy. Nick Bielke – Business Manager
Nick Bielke is the business manager for National Rejuvenation Centers of St. Louis. He has extensive finance and managing experience. Nick and his wife, Amy, have been together for 20 years and have two boys. Once reaching the age of 35, he felt a lack of energy, poor sleep quality, and not getting results from his workouts. After starting the rejuvenation program, his overall health, energy level, and quality of life have improved so much that he is dedicated to bringing that success to patients in St. Louis. 
Jeff Wittmer – Marketing Director
Jeff is a former Olympic Weightlifter who began at the age of 10 in his home basement gym. After a few months of training Jeff decided to enter his first meet and from there he had continued success by winning his first 50 competitions and accepted an invitation to the Olympic Training Center in Colorado Springs, CO to compete for the United States. Jeff earned his Bachelor Degree in Marketing from Lindenwood University and has taught weightlifting classes at numerous Crossfit gyms and serves as an instructor/demonstrator for Olympic Weightlifting seminars across the country. |
