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Meet the Neurobiologix Team

Our Founder / Chief Medical Officer


Dr. Kendal Stewart serves as the current Chief Science Officer (CSO) for Neurobiologix, Dr. Neurobiologix and GX Sciences. 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 and is the expert for the popular radio show Coffee With Dr. Stewart.

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 has been tapped to speak at national conferences over 50+ 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 Executive Officer



Kara Stewart-Mullens is one of the founders and Chief Executive Officer of Neurobiologix, Dr Neurobiologix and GX Sciences. 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.” - Kara Stewart

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.