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Meet Our Care Team

A male doctor in a lab coat holds a stethoscope and crosses his arms over his chest.

Thousands of patients, over a decade of experience.

Consult with the Experts

Our care team has extensive experience in hormone restoration, sexual health treatment, and integrative wellness. They’re passionate about helping patients improve their lives and feel their best.

Defy Medical’s care team is led by Dr. Justin Saya, our medical director and lead practicing physician.

A photo of Defy Medical's medical director and lead practicing physician Dr. Justin Saya.

Medical Director and Lead Practicing Physician

Justin Saya, MD

Dr. Justin Saya graduated as class valedictorian from North Carolina State University with a dual bachelor’s degree in Biological Sciences and a bachelor’s degree in Economics. He received his medical degree from the University of North Carolina at Chapel Hill, School of Medicine, and subsequently performed his internship and residency training at the University of South Florida/Morton Plant Mease Family Medicine Residency Program.

In addition to his education and training, Dr. Saya is privileged to hold many certifications, honors, and memberships, including membership to the American Medical Association, the American Association of Family Practitioners, and the World Anti-Aging Academy of Medicine, among many others.

Dr. Saya offers therapy to both men and women who are looking to balance their hormone levels and improve their overall quality of life. His patients have reported benefits such as improved energy levels, restored libido, improved muscle tone and exercise tolerance when combined with an exercise routine, healthy/sustainable weight loss when positive eating and exercise habits are adapted, and much more.

He hears repeatedly from Defy patients that hormone replacement therapy is one of the best decisions they’ve ever made.

Caleb Calkins, MD

Dr. Calkins is focused on optimum health for his patients. He believes in a proactive approach to medicine that emphasizes maintaining an appropriate balance of nutrition, hormones, and fitness. He is dedicated to finding the root causes of his patient’s symptoms and the appropriate treatment regimens for complete wellness.

Dr. Calkins completed his bachelor’s degree in Public Relations with a minor in Nutritional Science at the University of Florida. While there, he was involved with research focused on the benefits of a ketogenic diet in improving epilepsy. He received his medical degree from St. Matthews University, and subsequently performed his internship and residency at Tulane University/East Jefferson General Hospital Family Medicine Residency Program in New Orleans, Louisiana. In addition, he received a master’s degree in Hospital Administration from Davenport University in Grand Rapids, Michigan.

Throughout his education and experience, Dr. Calkins has seen the benefit of using multiple modalities to improve patient outcomes.

A photo of Defy Medical's Dr. Calkins.
A photo of Defy Medical's Beth Bray, APRN.

Beth Bray, APRN

Beth Bray, APRN, comes to Defy with over two decades of medical experience. She started her career after graduating from Prairie State College and became a Registered Nurse where she worked in hospital settings for orthopedics and oncology.

In 2015, she completed her graduate degree from Northern Illinois University and began working in Primary Care and Integrative Holistic Care.

Beth cites the importance of forming a partnership with her patients to help them work towards optimal health goals and allowing them to live their absolute best lives. Additionally, Beth feels that Defy is on the cutting edge of hormone replacement therapy and integrative wellness.

Beth recently made the trek from icy Illinois to sunny Florida and became a member of the Defy Medical team in February of 2021. Since moving to Florida, she’s developed a passion for gardening and just about anything else the Florida sunshine has to offer. Beth is also an avid reader and is usually zipping through an Octavia Butler Sci-Fi novel in her free time.

Jill Dillenburg, RN

Jill Dillenburg, RN, has practiced as a board-certified registered nurse for the past 10 years.

She has specialized in the areas of hormone replacement therapy and cardiology. Since 2014, Jill has practiced with Defy as both a provider and the medical manager to Defy’s team of medical assistants.

Jill graduated from Galen College of Nursing in 2010 with a Registered Nurse degree. She initially practiced in cardiology assisting with clinic patients, nuclear stress testing, and pacemaker implantation before starting with Defy. Jill is enthusiastic about helping individuals rediscover themselves in mind and body for optimal health and happiness.

Her approach to hormone replacement therapy is a holistic one, addressing both hormone levels and lifestyle factors to improve one’s daily quality of life. Due to her many years of practicing as an IV nutritional specialist, she is proficient in evaluating for vitamin and mineral deficiencies that contribute to fatigue, weight issues, and cognitive function. Jill finds patient education via telemedicine both rewarding and gratifying. She empowers individuals to be their own best advocate through a deep understanding and knowledge of their health.

A photo of Defy Medical's Jill Dillenburg, RN.
A photo of Defy Medical's Mellisa Faulk, PA-C.

Melissa Faulk, PA-C

Melissa Faulk, PA-C, graduated Summa Cum Laude from South University in 2003 with a Bachelor of Physician Assistant Studies. Melissa is a NCCPA (National Commission on Certification of Physician Assistants) board-certified physician assistant with nearly 20 years of clinical experience in the fields of military medicine, orthopedic trauma, cardiology, and hormone replacement. She has specialized in men’s health for more than 10 years.

Melissa has a passion for U.S. military service members and veterans due to her personal service in the Army. She served as the lead PA for Army’s Center of Aviation SERE-C course, graduated from the Army Flight Surgeon course in 2009, and served several years in Afghanistan caring for U.S. soldiers.

Melissa approaches patient care from a functional perspective, seeking to uncover and address the root cause of imbalance. She also understands that optimized health requires an integration of physical, mental, and psychological well-being.

Melissa is diligent in partnering with patients to formulate individualized plans to meet their health and wellness goals, whether that be increased energy, vitality, or changes in body composition.

Mike Linkous, PA-C

Mike Linkous, PA, completed his bachelor’s degree in Adult Fitness/Exercise Science at Marshall University in West Virginia. He received his Physician Assistant degree from The College of West Virginia in Beckley, West Virginia in 2000. Since then he has worked in Sports Orthopedics, Family Medicine, Integrative Hormone Medicine, and Pain Management.

As a member of the Defy Medical provider team, Mike takes an integrative approach to treating patients. In addition to his extensive medical training and practice, Mike also brings unique personal perspective to his patient consultations as he has been on TRT for more than 15 years.

A photo of Defy Medical's Mike Linkous, PA-C.
A photo of Defy Medical's Janel Mayer, MSN, APRN.

Janel Mayer, MSN, APRN, FNP-C

Janel Mayer, MSN, APRN, FNP-C obtained her bachelor’s degree in Nursing from Penn College in 2004 and gained valuable experience caring for critically ill patients at some of the finest facilities on the east coast. In 2014, she completed her graduate degree as a family nurse practitioner at Chamberlain College of Nursing. She went on to obtain certifications in the fields of nutrition, weight loss, hormone balancing, and aesthetics through Empire Medical.

As a nurse practitioner with more than 15 years healthcare experience, Janel’s passion for improving overall health and vitality through diet/lifestyle modification and hormone balancing is evident in the meticulous care she provides to her patients. She loves helping patients look and feel their best through comprehensive treatment plans based on their individual needs and desires.

Ben Walker, APRN, DC

Ben Walker, APRN, DC received his Doctor of Chiropractic degree in 1989 and has been a nurse practitioner since 2014.

His interest in the integrative approach to healthcare inspired him to explore and understand the many facets of optimizing personal health. When working with his patients, Ben applies his years of medical knowledge and practice to understand the physical, nutritional, and emotional aspects of a patient’s lifestyle.

Ben himself has been on bio-identical hormone replacement therapy for the past 4 years and has had the opportunity to get acquainted with the many benefits of a thorough and comprehensive approach to using HRT as a means to restore a patient’s overall well-being. His in-depth and personal experience with integrative healthcare allows him to truly understand the various needs of his patients.

A photo of Defy Medical's Ben Walker, APRN, DC.

What Patients are Saying

Showing our most recent 4- & 5-star reviews.

TrustScore 5 out of 5 See All 695 Reviews on Trustpilot

See More Testimonials

“The Best”

Visited on January 26, 2023

There is no one with more experience and expertise than Dr Saya. He is the only doctor I trust with my health.


5 out of 5

“Great Dr. Listens and is up to date on latest”

Visited on January 23, 2023

Dr is outstanding, listens to pts and treats aggressively. Not hesitant to Rx HRT, TRT meds at doses for optimal results.


5 out of 5

“Beth was personable and professional!”

Visited on January 26, 2023

Beth was personable and professional!


5 out of 5

“Janell was very friendly”

Visited on January 23, 2023

Janell was very friendly, knowledgeable and easy to talk to


5 out of 5

“Dr saya explained everything well and…”

Visited on January 26, 2023

Dr saya explained everything well and listened and adjusted what I needed.


5 out of 5

“I’m had a very good experience and I hope you do too:)”

Visited on January 25, 2023

I’m had a very good experience! They where backed up for Christmas but I just had my initial visit with there doc and have nothing but good things to say! He took his time answered everything and just had patience. There whole staff is wonderful and I’m hoping to keep having good encounters because that is everything to me. And trust me I’m a very thorough person and they just didn’t complain and never not once rude you need to try for your self and see. Prices are great and discounted tests can’t go wrong.


5 out of 5

“Jill is Excellent”

Visited on January 24, 2023

Jill is very helpful, knowledgeable and professional. I’m grateful that I’ve been able to consult with her for many years now.

–Jeffrey Ambrose

5 out of 5

“Dr Saya is the best!”

Visited on January 24, 2023

Dr Saya is friendly, smart, and cares. He’s the best!

–Cameron Mitchell

5 out of 5


Visited on January 26, 2023

Friendly, caring, Knowledgeable and good communication


5 out of 5

“I told her that she’s my miracle…”

Visited on January 24, 2023

I told her that she’s my miracle worker! Super sweet, very knowledgeable and caring. Really takes her time to listen and go over lab work and how it correlates with my symptoms and then offers a solution! I will continue to request Beth for every appt!


5 out of 5