Darryl D. Robinson, MD

Darryl D. Robinson, M.D.

Medical Director

  • Board Certification – American Academy of Anti-Aging and Regenerative Medicine

  • Board Certification – American Board of Physical Medicine and Rehabilitation with a subspecialty in Pain Medicine

  • Fellowship – Baylor University Medical Center, Texas

  • Fellowship – St. Anthony Hospital, Oklahoma

  • Residency – Carolina’s Medical Center, North Carolina

  • Internship – Walter Reed Army Medical Center, Washington, D.C.

  • Medical School – Medical College of Virginia

Dr. Darryl D. Robinson was born and raised in Richmond, Virginia. He obtained his undergraduate degree from Howard University in Washington, D.C., where he graduated Phi Beta Kappa and magna cum laude in 1991. He then went on to the Medical College of Virginia in Richmond, where he earned both the Alumni and Health Professional Scholarships, graduating in 1995.

In 1995, Dr. Robinson was commissioned as a captain into the United States Army and completed an Internship at Walter Reed Army Medical Center in 1996. From 1996 through 1998 he worked as a General Medical Officer at Winn Army Community Hospital, Fort Stewart, Georgia. He resigned his active-duty commission in 1998 and continued in the individual ready reserves through 2004.

Dr. Robinson completed a Residency in Physical Medicine and Rehabilitation at Carolinas Medical Center, Charlotte, North Carolina, in 2001. From 2001 through 2002, he completed a subspecialty Fellowship in Pain Medicine via Baylor University – Saint Anthony North Ambulatory Surgery Center, Oklahoma City, Oklahoma.

Dr. Robinson became a member of Oklahoma Sports Science and Orthopedics in 2002 and is board-certified by the American Board of Physical Medicine and Rehabilitation with a subspecialty in Pain Medicine.

After more than a decade of providing comprehensive, state-of-the-art treatment for pain syndromes, Dr. Robinson in 2012 was acknowledged by Castle Connolly as one of the region’s top physicians. One thing that has become apparent is that pain programs that rely primarily on conventional pharmaceutical medications are limited. For this reason, Dr. Robinson began to search for treatment alternatives that would expand his comprehensive approach and improve clinical outcomes. This approach focuses on optimizing the body’s natural functional and restorative capacity via the tenants of nutrition, hormone optimization and wellness.

In pursuit of the most heavily researched and vetted approaches, he became a Certified Fellow and board-certified by the American Academy of Anti-Aging and Regenerative Medicine. These concepts have served as his inspiration as medical director of Longevity Regenerative Institute. In 2012, Dr. Robinson was also selected into the inaugural class of “Pink Tie Guys” by the Susan G. Komen affiliate in Central and Western Oklahoma to serve as an ambassador for women’s health in the fight against breast cancer.

Jason Leinen, MD, ATC

Jason Leinen, M.D., ATC
  • Board Certification: American Board of Family Medicine with added qualifications in Sports Medicine, Certified Athletic Trainer by the National Athletic Training Board of Certification

  • Fellowship: Sports Medicine – University of Oklahoma

  • Residency: University of Oklahoma

  • Medical School: University of Oklahoma College of Medicine

Dr. Jason Leinen provides complete family medicine and sports medicine care. He is double board-certified and can provide athletes with complete pre- and post-injury consultation and assessment. Dr. Leinen is also Oklahoma City’s only Certified ImPACT Concussion Management physician.

Dr. Leinen has a heart for medical missions where he’s active in the pursuit of humanitarian aid. He has traveled to Guatemala, Peru, Ecuador and Haiti in his mission to provide medical care to those in need. He’s a committed family man where his wife, Julia, and their three children enjoy going to Thunder games and visiting the Myriad Gardens.

During his residency, Dr. Leinen attended a sermon on adoption and felt led to adopt their youngest son from Africa.

Raina Hamlin, MSN, APRN-CNP


nurse practitioner

Raina is a Nurse Practitioner licensed in the state of Oklahoma. Prior to doing primary care, she attained many years of experience as a registered lead nurse in emergency medicine and hemodialysis. 

Raina graduated from Oklahoma City University, Sigma Theta Tau, with her RN., BSN.  She then went on to graduate school at Purdue University. There she concentrated her studies in family medicine and primary care. She has completed rotations in family medicine, primary care, women’s health gynecology, and pediatrics. She graduated with honors and obtained her Masters of Science in Nursing and Family Nurse Practitioner Degree.

Raina is licensed and board certified through the Oklahoma Board of Nursing and also by the American Academy of Nurse Practitioners National Certification Board. As a Nurse Practitioner, her approach to health is to individualize care and promote the quality of life for each patient by prevention of illness and promotion of a healthy lifestyle.

 Raina was born and raised in Oklahoma, where with the encouragement of her mother began her career in nursing.  She is married and has 2 children. Her favorite pastimes are outdoor activities such as hiking, kayaking, and swimming.

Melanie Boggs, MSN, APRN, CNP

Michelle Wray, PA-C


Melanie is a Nurse Practitioner licensed in the state of Oklahoma, board certified by the American Academy of Nurse Practitioners. She originally attended Oklahoma City University where she received her Bachelor’s of Science Degree in Nursing, graduating with honors. As a registered nurse Melanie gained experience in the operating room as well as emergency medicine. While working as a registered nurse in the emergency department Melanie attended Purdue University where she graduated with high distinction, obtaining her Masters of Science in Nursing, Family Nurse Practitioner Degree. Melanie’s combination of clinical experience as well as outstanding academic background provide a strong foundation for providing excellent patient care. As a Nurse Practitioner, Melanie uses a holistic approach that focuses on understanding and addressing the patient’s concerns, educating the patient on healthier lifestyles to maintain wellbeing, and collaborating with other healthcare professionals to facilitate the best practice and yield more positive outcomes.

Melanie was born and raised in Edmond, Oklahoma. Melanie and her husband Patrick have 3 children, two boys and one girl. She most enjoys spending time with her family, especially enjoying activities outdoors. Melanie and her family love to take vacations and travel as well as spend summers at the lake.

Lee M. Germany, PA-C

Lee M. Germany, PA-C

Certified Physician Assistant

After working for the FAA for 30 years as an electronic engineer, Lee was led in a different direction. He answered a calling toward medical mission work. He proudly volunteers in developing nations, such as Honduras, through the Baptist Medical, Dental, Mission International.

He received his Master of Health Sciences from the University of Oklahoma Health Science Center in 2007. After graduating, he has attained experience in several areas of medicine including Family Practice, Emergency Medicine and Neurosurgery, enabling him to pull from multiple avenues to provide the best care available.

Lee is the office jokester, plays the saxophone, hates spinach and loves spending time with his wife of 43 years, Iva, and three grandchildren.

Dena Bradford

Dena Bradford

Director of Operations

Dena oversees all operational aspects of Longevity Regenerative Institute. These include working closely with providers and staff to ensure they have the best training, tools and equipment needed to deliver excellent care. She works with local and national vendors to meet our strategic goals while ensuring Longevity stays true to budget, mission, vision and values.

Dena has a master’s degree in health and human services, a bachelor’s degree in health care administration and an associate’s degree in health information management. Dena’s background is in leading high-performing and quality-oriented teams in both hospitals and large physician group practices across the country. She believes balance is a key to Longevity, and in her free time, Dena alternates between teaching meditation and running with her spouse behind two small children and a dog.

Support Staff

Dr. Darryl D. Robinson’s medical and support staff is a very diverse team. The staff strives to deliver quality healthcare to each individual patient while creating a comfortable and professional environment for their patients and family members. Each patient is personally greeted with a smile upon arrival, and our medical staff is committed to excellence and building lasting relationships through patient education and trust. Our team is devoted to listening and communicating with their patients to accomplish the patients’ overall health goals.