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Meet the GX Sciences' Team

Our Founder / Chief Medical Officer

Dr. Kendal Stewart

Dr. Kendal Stewart serves as the current Chief Science Officer (CSO) for GX Sciences, Neurobiologix, and Dr. Neurobiologix. He’s also a member of the American Academy of Anti-Aging Medicine. In addition, he founded and serves as Chairman for the Neurosensory Centers of America.

Dr. Stewart graduated from the University of Texas at Austin with a BA in Biology with Honors as well as a minor in Chemistry. He graduated with a Medical Doctorate from the University of Texas Medical School, where he also received a Distinguished Student of Clinical Medicine Award for the class of 1988. He served as a biomedical research assistant under Takahashi Yamora, PhD, in the Department of Biochemistry and Molecular Biology at MD Anderson Cancer Institute. There, he researched biochemical analysis of surface protein markers in colorectal cancers.

Dr. Stewart completed his residency at University of Texas Houston Affiliated Hospitals and MD Anderson Cancer Institute. During his residency, he received multiple awards, including the Outstanding Clinical Resident Teaching Award in 1993 and the Outstanding Resident Research Award & Scholarship from the Texas Medical Association/Texas Association of Otolaryngology in 1992. He was explicitly selected for a highly sought-after Fellowship in Otology and Neurotology - Skull Base Surgery at Baylor University Center in Dallas. During this time, he also served as a Clinical Adjunctive Professor.

Dr. Kendal Stewart is a Board-Certified Otolaryngology/Head and Neck Surgery specialist and has sub-specialty training in Otology and Neurotology - Skull Base Surgery. He served as a Clinical Associate Professor at the University of Texas Medical School at San Antonio’s Department of Otolaryngology from 1994 to 1996. He’s been tapped to speak at national conferences over 40 times as a result of his expertise. Additionally, Dr. Stewart has volunteered his time for numerous academic pursuits, including assisting in designing Masters and Doctorate candidate projects for the University of Texas Department of Kinesiology, Psychology, and Speech and Language Development, as well as assembling a patient database for these efforts. He has also participated in two doctoral candidate review boards at the University of Texas.

Dr. Stewart's medical practice in Austin, Texas is highly sought after by patients from across the globe. Providers worldwide come to his clinic to train with Dr. Stewart and learn his protocols. He also has a successful radio show with his sister called "Coffee With Dr. Stewart". With an extremely busy practice and overseeing the development of nutritional formulas and genetic testing for GX Sciences, Dr. Stewart still makes time for his family of four children and wife of 15+ years. Dr. Stewart's family and faith in God is what he says is essential to his success.

Our Founder / Chief Marketing Officer

Kara Stewart-Mullens is one of the founders and Chief Marketing Officer of GX Sciences, Inc and Chief Executive Officer of Neurobiologix, Dr Neurobiologix. Although her past work history and experience lies mostly in the consumer goods management sector, her drive to market and sell products comes very natural to her. Her intense interest and education in psychology led her to choose the field of advertising and sales so that she could understand how the human mind works and makes choices. “If you put yourself in the shoes of the consumer and not as the seller then you will achieve much more success in sales and building relationships.”

With over 25+ years of experience, her expertise in sales management, marketing and brand development speaks for itself. Guiding Neurobiologix for 10+ years to be a recognizable and national nutrition brand has been a joy and blessing. With her own family who suffers from moderate Neuro-Immune Syndromes, genetic testing and clean nutritional formulas allows her to give her family and others the gift of quality nutrition with genetic validation that can help someone be their best and improve their health. This is what warms her heart the most. “If I can touch one person with the gift of finding our products then I have done my job.” Now with the validation of nutrigenomic testing and the development of GX Sciences, the thrill of helping people with scientific backing through DNA analysis is the icing on the cake that allows both companies to succeed.

She also shares her passion for health and wellness with her older brother, Dr. Kendal Stewart, by hosting a popular radio show "Coffee With Dr. Stewart". With over 500,000 downloads the siblings share their stories and Dr. Stewart shares his medical expertise to bring people hope and knowledge to health challenges they may face. She is also a member of the American Academy of Anti-Aging Medicine.

Our Chief Executive Officer

Michael Willoughby

Michael Willoughby is a seasoned veteran in the laboratory sector. He started his career as a Laboratory Tech and Histologist in Nacogdoches Texas where he double majored in Nursing and Medical Technology at Stephen F. Austin. Before and during college Michael served in the armed forces as an Army Combat Medic.

After college Michael moved to Houston in 1991. There he established a small placement firm of Histologists throughout the Texas Medical Center (TMC). While building relationships in the TMC, Michael formed a solid foundation of healthcare knowledge through partnerships with the likes of MD Anderson, The DeBakey Heart Center, Baylor College of Medicine, and both Methodist and Memorial Healthcare systems.

In 1994 Michael was approached by the senior leadership team of Clinical Pathology Laboratories to help scale the company beyond the Austin borders. To make a long story short, he spent the first 10 years building business units throughout the Southwest and the second ten years as CPL’s Senior Vice President overseeing Operations and Commercial Services from the corporate offices in Austin Texas. During that time, he was successful in creating high throughput service units, created a very successful sales division, presented multiple acquisition opportunities, and lead a key role in fostering the culture of what was set by the founders of the company. CPL was ultimately purchased by Sonic Healthcare and is still one of the great success stories in the laboratory sector today.

Although many thanks were given to the folks at CPL… now Sonic Healthcare, Michael chose to leave the company in 2014 to explore global opportunities beyond the Southwest area of the country. Over the past 36 months, Michael has consulted for several laboratory companies such as Cardio Vascular Biomarker Labs, Non-Invasive Prenatal Testing Labs, and private labs looking to reorganize or develop a commercial sales force. Not to mention Co Founding a new patient access service called Iggbo (an Uber like blood drawing service). All along he knew his next stop would be with a company that was innovative, service related, and had the opportunity to make a difference in people’s health.

Our Director of Genetic Services

Mary Beth Sykes is the Director of Genetic Services for GX Sciences where she manages daily operations of the clinical laboratory, such as overseeing quality standards and regulatory compliance. She began her career in the area of molecular genetics in 2014 after graduating from the University of Texas at MD Anderson School of Health Professions.

Her previous experience includes managing a molecular genetics laboratory which focused on commonly inherited autosomal recessive disease and molecular-based infectious disease testing. At GX Sciences, Mary Beth helps implement rigorous quality control standards, develop procedures and policies, validate new assays and instruments, and assist in the design of a custom Laboratory Information System.


Paula Carper is a Registered Dietitian, and the Corporate Trainer for GX Sciences where she provides guidance for our providers, introducing and training them to use our nutrigenomic testing.

Paula obtained her BS in Dietetics at University of Louisiana at Lafayette and went on to complete her Dietetic Internship at Texas Woman’s University in the Houston Medical Center, where she also earned a Master of Science in Human Nutrition.

With over 20 years of experience as a nutrition professional, Paula has worked in a variety of settings, providing clinical nutrition, consulting, and education services. She understands the challenges that practitioners face in providing precision care, and she joined GX Sciences because she’s seen first-hand, the impact of nutrigenomic testing for both providers and patients.

Her previous experience includes 16 years in the healthcare setting as a clinical dietitian in acute care, and the long-term care settings. Her most recent experience as a Functional Medicine Nutrition Practitioner in solo practice has been the most rewarding to date. She is even more excited to work with GX Sciences and their providers to support them as they seek to provide the most innovative solutions for their patients.

Paula’s passion for dance and movement inspired her to have a parallel career of over 30 years in the Wellness industry, as a fitness and dance instructor. She continues to practice nutrition and teaches Pilates and Ballet Barre alongside her identical twin sister, Patti. Her passion for helping others through nutrition and movement continues to be a lifelong adventure.