USANA’s Scientific Experts

USANA’s world-class scientists review the latest scientific literature and clinical studies on important nutrients, vitamins, minerals, and phytochemicals. They also test the potency and purity of every USANA product to ensure complete and balanced formulas. USANA scientists come from varying fields of expertise, and most have published numerous papers in their careers.

Rob Sinnott, PhD
Chief Scientific Officer
With more than 25 years of experience in biotechnology, nutrition, and global business development, Dr. Rob Sinnott is responsible for ensuring USANA remains at the forefront of unique scientific innovation. As chief scientific officer, he manages all aspects of global research and development, building on and preserving the legacy of Dr. Wentz, to improve health worldwide.

John Cuomo, Ph.D.
Executive Director of Product Development and Technology
Dr. John Cuomo’s experience in synthetic organic chemistry, manufacturing, and analytical methods make his contribution to USANA invaluable. He holds over 20 United States and European patents and is the author of numerous scientific papers. "There are several areas that I think set USANA apart from other nutritional companies," Dr. Cuomo says. "The first is USANA's quality assurance in product development and manufacturing. Few companies have the level of quality control that USANA does. We spend a tremendous amount of time and money making sure that product composition exactly matches what's on the label. One of the ways we do that is through our in-house testing of ingredient potency."

Dr. Cuomo has seen many other companies include product lines solely based on the marketability of the products. "We won't jump on the bandwagon to join the latest health craze simply to make a profit."

Michael Fuhrman, DC
Dr. Michael Fuhrman received his doctorate in chiropractic from the Palmer College of Chiropractic in 1995. Dr. Fuhrman has been in the nutraceutical industry as a formulator and educator for the past eight years, with nearly 12 years experience as a chiropractor specializing in nutrition and herbal medicine. He came to work for USANA in 2012 and now holds the title of senior executive director of research and development.
Dr. Fuhrman oversees product development, the clinical testing program, and the science information services group, while working closely with USANA’s quality assurance, quality control, and marketing teams.

Brian Dixon, Ph.D.
Executive Director of Health and Science Education

Dr. Brian Dixon joined USANA’s department of research and development in January of 2009. As an integral member of USANA’s scientific staff, Dr. Dixon’s main role was to facilitate and manage all human clinical studies conducted at, and funded by, USANA. In November of 2014, Dr. Dixon was asked to head up the newly formed department of health and science education as its executive director, where he continues to lecture internationally on the importance of nutrition for optimal health.
Dr. Dixon earned his PhD in molecular and cellular biology from Oregon State University, where he focused his research on the underlying biochemical mechanisms of the aging process and the therapeutic potential of R-alpha lipoic acid.

Mark Brown, Ph.D.
Director of Product Development

Dr. Mark Brown has completed extensive research in bioorganic chemistry and holds a Ph.D. in organic chemistry from the University of California and a bachelor’s degree in chemistry from California State University, Chico. With more than 15 years of chemistry experience, he is a valuable member of USANA’s scientific team.


Jeremy Tian, PhD, MD
Dr. Jeremy Tian has a PhD in nutrition from Emory University and an MD in clinical medicine from Shanghai Medical University. Before he joined USANA in 2013, Dr. Tian worked for several years as a scientist in basic biomedical research at Stanford University and as a gastrointestinal surgeon in China. He is the author of 16 peer-reviewed research articles and a number of conference publications and editorials.
Dr. Tian’s work at USANA is mainly to use his biological, nutritional, and clinical expertise for product innovation. He is one of the pioneers that developed the strategy of USANA InCelligence Technology™ and kept the company a scientific leader in the supplement industry.

Keijun Koh
Product Development Manager

Ms. Keijun Koh is a licensed pharmacist, who previously worked at a biochemistry laboratory as well as one of the leading trading companies in Japan, where she oversaw regulatory affairs and product development. Ms. Koh joined USANA Japan in 2003 and has since relocated to USANA’s Home Office in Salt Lake City, Utah. She currently focuses on the development of products for USANA’s Asia Pacific markets.

Jim Eng

Jim Eng
Senior Formulator

Mr. Jim Eng has been with USANA Health Sciences since 1996 and is currently the R&D Project Manager. He holds a bachelor of science degree in chemical engineering from New Jersey Institute of Technology and has more than 27 years of experience in the pharmaceutical and nutritional industry. As project manager, one of Mr. Eng’s primary functions is to transform research and development ideas into high-quality nutritional products.


Rachel A. Brewer, Ph.D.
Dr. Rachel A. Brewer is a laboratory-trained scientist with a background in molecular biology and nutrition. Growing up surrounded by nature in small-town Alaska, she developed an interest in health and nutrition that guided her career. She completed her undergraduate studies in biological sciences, with a focus on molecular biology, at the University of Alaska Anchorage. During that time, she interned at the Medizinische Hochschule Hannover in Hannover, Germany, researching bacterial contributions to inflammatory bowel diseases.
Doctoral studies took Dr. Brewer to the University of Alabama at Birmingham, home of the world-renowned Nutrition Obesity Research Center, where she investigated diet and nutritional impacts on aging and longevity, with a goal of understanding nutritional interventions to help people live healthier, longer lives. Her prior research also explored the role of the molecular circadian clock, in order to understand how time of day at the cellular level can impact health and disease.
Dr. Brewer has presented her research at both national and international scientific conferences and has won awards for her scientific endeavors from multiple organizations, including the American Society for Nutrition and the Society for Heart and Vascular Metabolism. Previously, she headed-up the quality control department for a water testing laboratory, ensuring that public water systems remained in compliance with safe water standards. Her interest in improving health through her research experience and expertise in the microbiome has currently led her to continue her work at USANA Health Sciences.


Jessie Nicodemus Johnson, PhD
Dr. Nicodemus Johnson is a molecular biologist, specializing in genomic, big-data analysis.  She earned bachelor of science and master of science degrees in biology from the University of Notre Dame, and a master’s degree and PhD in physiology from the University of Illinois, Urbana-Champaign. Dr. Johnson was an American Heart Association fellow in the Department of Human Genetics at the University of Chicago, where she received training in the statistical analysis of genomic datasets. At USANA, she draws on her broad physiology background and training in genomics to contribute to USANA research-and-development efforts.

USANA Health Sciences is known for manufacturing the highest quality products backed by a potency guarantee. To ensure you and your family are receiving genuine world-class USANA products, purchase them only through your independent USANA Associate or
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