Our Team

Meet Your Providers

At Opt Health, we believe there’s a better way to practice medicine. We aim to bridge the gap between patients and health care. Opt Health gives you the option to meet a professional doctor, face-to-face, from the comfort of your home. We’re excited to answer questions and empower our patients to be healthy, happy, and safe.
Meet The Team
Meet The Team

John Tidwell, MD

Chief Medical Officer

Dr. John Tidwell is Opt Health’s Chief Medical Officer. As an orthopaedic trauma surgeon, Dr. Tidwell quickly discovered the lack of emphasis that conventional medicine places on preventing disease. Why treat diseases when we can prevent them altogether?

This insight led Dr. Tidwell to seek out a BHRT L1 certification from the Academy of Preventive and Innovative Medicine as well as training from the American Academy of Anti-Aging Medicine (A4M). So when childhood friend Camilo Isaza (Opt Health’s co-founder and CEO) reached out for help with a telehealth platform focusing on men’s wellness and preventive medicine, Dr. Tidwell was immediately on board.

Dr. Tidwell graduated from Georgia Tech at the top of his class with a degree in engineering before discovering and pursuing orthopaedics, a field of medicine that merges engineering with human physiology.

After graduating from the Medical College of Georgia at Georgia Regents University in 2008, Dr. Tidwell completed his residency at West Virginia University Hospitals and an orthopaedic trauma fellowship at Penn State’s Milton S. Hershey Medical Center. From 2015 to 2017, Dr. Tidwell served as a clinical instructor of orthopaedic surgery for Community Regional Medical Centers in Fresno, California.

Besides his work as a surgeon, Dr. Tidwell has contributed extensively to research in the field of orthopaedics, with papers appearing in Injury, the Journal of Orthopaedic Trauma, and the American Journal of Orthopaedics. He has also given lectures on his work throughout North America.

In his spare time, Dr. Tidwell pushes the limits of his endurance by competing in marathons and triathlons.

Graham Simpson, MD

Co-Medical Director

Dr. Graham Simpson is one of the world’s leading experts on anti-aging, sexual rejuvenation, and diabesity.

Since graduating from the University of Witwatersrand Medical School in Johannesburg, South Africa, Dr. Simpson has made it his life’s mission to reverse lifestyle-caused chronic diseases. In addition to being board-certified in internal, age management, and emergency medicine, Dr. Simpson is a licensed homeopath, a BHRT expert, and an advocate of holistic and proactive approaches to achieving and maintaining good health.

Dr. Simpson is a founding member of the American Holistic Medical Association (AHMA) and has also published several books, including WellMan: Live Longer by Controlling Inflammation, The Metabolic Miracle, and The 4-Week Diabesity Cure. Additionally, he co-authored Spa Medicine: Your Guide to the Ageless Zone and Eternity: A Guide to Immortality.

Dr. Simpson’s dedication to wellness through preventive medicine and holistic health practices makes him a natural fit for the Opt Health team.

Meet The Team
Meet The Team

Ranjith Ramasamy, MD

Medical Advisor

Dr. Ranjith Ramasamy is one of the top authorities on male infertility and sexual dysfunction. He is the director of male reproductive medicine and surgery as well as an associate professor in the Department of Urology at the University of Miami in Florida.

After graduating from UMDNJ Robert Wood Johnson Medical School, Dr. Ramasamy completed his urology residency at Weill Cornell Medical College and New York-Presbyterian Hospital and a National Institutes of Health-sponsored fellowship in male reproductive medicine and surgery at Baylor College of Medicine.

Dr. Ramasamy has contributed extensively to his field. He has published over 250 manuscripts in peer-reviewed journals and several book chapters. Additionally, he currently serves on the editorial board of Andrology, Asian Journal of Andrology and Urology as well as as an editorial reviewer for medical journals such as Journal of Urology, Fertility and Sterility, European Urology and British Journal of Urology. At University of Miami, he is currently leading important clinical trials for erectile dysfunction and low testosterone treatment.

Jeremie Walker, MD, MBA

Opt Health Physician

After a decade of practicing anesthesiology in surgical settings, Dr. Walker realized the importance of connecting with patients earlier in their journey to restore health through natural and preventative means. Like his colleague Dr. Tidwell, Dr. Walker’s medical philosophy turned away from the traditional approach of treating disease to a more progressive philosophy of preventing disease in the first place.

Dr. Walker believes that the best approach to giving patients a more optimized quality of life is to encourage better lifestyle choices and balance declining hormone levels. By following a simple but consistent wellness regimen, patients can age gracefully with the energy, focus, drive, and enthusiasm of a young adult.

Dr. Walker completed his schooling and residency at West Virginia University School of Medicine. He also received a post-graduate MBA from WVU. After completing his residency, Dr. Walker served as the assistant director of anesthesia at Mount Carmel West in Columbus, Ohio, and now practices at Atrium Health in Charlotte, North Carolina.

In addition to his work in the medical field, Dr. Walker is the founder of Noble Oat. Noble Oat is dedicated to producing great-tasting and intentionally sourced snack foods that fuel a healthy lifestyle.

Dr. Walker practices what he preaches, with an ongoing commitment to functional training, cleaning eating, and high-quality sleep. In his spare time, he enjoys recreational sports and spending time outside with his dog, Nash.

Meet The Team

Born in the USA

Longevity doctors

Born in the USA

All Opt Health prescriptions are manufactured in the USA at state-of-the-art, fully licensed compounding facilities with the strictest commitment to quality assurance.