We are a group of fitness and nutrition fiends that love learning new methods, theories, and techniques within the industry. As a team, we come from a diverse set of backgrounds, from physiology and exercise science, to kinesiology, to even business and psychology.

We’re all athletes in our own realms - powerlifter, figure competitor, marathoner, and swimmer. We’ve all realized that regardless of what your fitness/health goals are…you’re much better off if you know where you are, so you can know where you want to get to!


Tiffany Harlan

Master of Disaster
(AKA our awesome Founder/CEO)

Tiffany Harlan started Composition ID in January 2014 and brings over 12 years of experience in the fields of preventative health, fitness, aging, exercise physiology and advanced diagnostic testing. Most recently, Tiffany has worked alongside multiple physicians for one of the top age management institutes in the nation, specializing in elite performance testing, exercise and nutrition programming; while at the same time growing and managing a new local health club as the Fitness Director for a large spa and wellness industry provider.

She is passionate about providing clients with as much information as possible about their bodies. And teaching and empowering them with that data to ensure that her clients are achieving the results that they set out to accomplish.

She holds a degree from the University of Maryland in Kinesiology and is a certified personal trainer, Spin instructor and nutritionist. She is the proud mother of three daughters and now calls Maryland home.

In her free time, she can be found binge watching the Bachelor (with a cup of strong, no-BS black coffee) or playing the role of director for her daughter's Beyonce and Shakira dance routines. 


Teresa Harris

Co-Conspirator & Organization Fiend

Teresa is a Co-Owner of Composition ID as well as its fearless Chief Operating Officer. She found her calling in the world of health and fitness after deciding to make a major career change from corporate management and following her passion of having a personal impact on the well-being of others. As an athlete herself, she's recognized the importance of knowing composition and performance numbers, which has played a significant role in maximizing her powerlifting performance capacity.

Teresa is currently a Tier 3+ Personal Trainer and Master Instructor at Equinox DC, a fitness and nutrition blogger, and
mind-body nutrition coach.

In her free time, Teresa finds herself experimenting in the kitchen, exploring DC on her scooter, and is always immersed in reading food memoirs, as she daydreams about her next life as an executive chef in international kitchens.


Dr. Thomas Clarke

Chief Medical Director

Thomas Clarke, M.D., MPH is the Medical Director of Medical Fitness Professionals and a certified Cenegenics physician. He has 27 years as a USAF physician focusing on Human Performance Optimization, with experience caring for some of the most highly trained Special Operations Forces of the U.S. military; and under some of the most difficult conditions imaginable.

He was trained at the Uniformed Services University of the Health Sciences and the USAF School of Aerospace Medicine where he was valedictorian of his medical school class and chief resident of his resident class. Dr. Clarke is board certified in Preventive Medicine and Aerospace Medicine, and is physician certified by Cenegenics Medical Institute.

His experience provides a broad and unique perspective on health, wellness and performance optimization. He has a true passion for functional training, exercise, nutrition, and health; practicing the lifestyle he recommends. He truly enjoys assisting his clients as they realize their true potential and maximize their health, wellbeing and vitality.


Virginia Kinkel

Master of Muscle Mass

Virginia’s career in the health field began nearly 10 years ago. With experience primarily in the commercial fitness industry, Virginia has moved from the ranks of Fitness Manager in the two largest Health Clubs in DC, to currently providing services as one of the District’s top ranked personal trainers. She combines her passion for understanding the complexities of the human body, with an innate desire to see others succeed. Virginia is currently a nationally ranked NPC Figure competitor which is where she was initially introduced to Composition ID. She utilized the DEXA Scan to evaluate her training and diet regimen and make the necessary changes to excel on stage. As someone who has experienced first-hand the power of Exercise Physiology, Virginia is eager to help others achieve their goals.

Virginia is originally from Massachusetts, but has been in DC for 4 years. She holds a degree from University of Maryland in Kinesiology, and is an NCSF Certified Personal Trainer.