Meet Our Professional Team

Cenegenics Houston

Each member of the Cenegenics® physician team has completed the Clinical Strategies for Healthy Aging in Age Management Medicine program, sponsored by the Age Management Medicine Education Foundation (AMMEF), the educational division of Cenegenics® Education and Research Foundation (CERF) - providing our physicians with a specialized skillset to practice this medical specialty.

Garth Denyer, M.D.

CEO & Institute Physician

Dr. Garth Denyer graduated from the University of Cape Town in South Africa in 1973. From 1973 until 1978, he completed his residency in internal medicine in South Africa and Canada. In 1981, he moved to The Woodlands, TX, and started the Oaks Medical Center where most of his practice centered on internal medicine. He became a Cenegenics® patient over ten years ago, and because of the personal success he had, he started taking an active interest in age management. He completed the Cenegenics® training and certification process and opened his office in The Woodlands in 2007. On July 1, 2011, he became a Cenegenics® partner and officially opened Cenegenics® Medical Institute of Houston. In his ongoing quest for knowledge, he has attended many motivational conferences to learn more about positively influencing his patients’ habits to help them change and meet their personal health goals.

Dr. Denyer is 66 years old, is 6’2”, and weighs 195 lbs. with 10% body fat. Other than his regular resistance and strength training, he plays racquetball and windsurfs in the spring.

Dr. Denyer and the Cenegenics® Houston team are committed to providing five-star service and helping patients achieve optimum health and well-being.

Dr. Denyer

Iryna Voyutska

Nutrition & Exercise Counselor

Iryna received her Physician Assistant degree with honor in 1985 and received her M.D. degree in 1998 from Odessa State Medical University, one of the leading medical universities in Ukraine. The school is a member of the International Association of Medical Universities, and the high standards of training at the institution are well recognized throughout Europe and America. With such a diverse student population, education is given in Russian, Ukrainian, and English languages.

During her studies, Iryna trained in Track & Field and was the fastest runner at the college from 1982 to 1985.
She also won the bronze medal for the county collegiate 400-meter race in 1985.

She has worked as a school physician for athletics, giving lectures about the importance of body composition, microelements, vitamins, and antioxidants as natural enhancers in sports competitions.

Since moving to Houston in 2006, she has continued her education in pathology, biochemistry, immunology, behavioral science, and clinical applications for age management medicine. She began her work with Cenegenics® in 2008, focusing on patient assessments and customized nutrition and exercise plans.


Steven A. Fein, MD, FACG


Board certified in Gastroenterology, Internal Medicine, Advanced Bio-Identical Hormone Therapy and Age Management Medicine. Dr. Steven A Fein attended medical school at the University of Florida. He did his Internal Medicine training at Baylor College of Medicine and his Gastroenterology training at the University of Texas Medical School. Dr. Fein has been practicing Internal Medicine/Gastroenterology in the Houston area since 1981.

Dr. Fein has achieved great success as a patient on the Cenegenics® Elite Program over the last 2 years. It is his success on the program that has motivated him to practice Age Management Medicine with Cenegenics.

Dr. Fein

Maggie Harris

Center Service Coordinator

On behalf of Cenegenics® Houston, I would like to introduce myself as your newest Center Service Coordinator, Maggie Harris. I am pleased to have recently joined the outstanding team of Dr. Denyer and Iryna Voyutska.

I have a background in Healthcare Administration and look forward to the opportunity of being able to grow with Cenegenics® and become an integral part of the team.

I consider myself a native having lived in the Houston area for over 40 years. When I’m not at Cenegenics® Houston, I enjoy spending time with my family, reading and writing.

Maggie Harris

Our team is ready to provide you with an incredible experience!