doTERRA’s Scientific Experts


Dr. David Hill

Founding Executive, Science & Healthcare

Throughout the world it is difficult to find an active doTERRA Wellness Advocate who doesn’t know and admire Dr. Hill. His rare combination of natural abilities to listen, love, and teach is well enriched with his vast understanding and knowledge of pure essential oils and how they collectively and independently offer solutions for health and wellness. As a founding executive, Dr. Hill has mentored thousands of Wellness Advocates throughout the history of doTERRA, which has helped cultivate the unique culture found within the organization. As the leading expert in essential oils at doTERRA, he challenges his team to find only the highest quality botanicals and ingredients and provide superior safety standards. He shares his knowledge openly in order to empower everyone to use these gifts of the earth and continues to find new and exciting products for the market.

Dr. Hill encourages the medical community to look at supplementary options when healing the whole person and encouraging wellness. He looks forward to a future where the essential oil community and modern medicine can co-exist in a doctor’s office so that people will have more options and control of their healthcare. Until this day arrives, he will continue to collaborate with the medical community through studies, trials and capable physicians.


Alexandrea Paul

Quality Assurance, Director

Alexandrea Paul obtained her MA and MPhil degrees in ecology, environmental and evolutionary Biology for Columbia University, New York with a focus on medicinal plants used in Haiti. Undergraduate BS degree in zoology from Brigham Young University, Provo, UT; She also has her Masters in Botany on the medicinal uses of Citrus form the University of Florida, Gainesville, FL.

Alexandrea has over 20 years of dietary supplement experience. Her previous experience as the head of quality in a direct selling environment as the quality director at MonaVie and Neways and as the head of quality in manufacturing environment as quality director at NuStar and Kelatron.

Alexandrea’s family is originally from Haiti; she grew up in New York, Port-au-Prince, Haiti, Nassau, Bahamas, Miami, FL and London, UK.


Nicole Stevens, M.S.

Research and Development Scientist

Nicole Stevens has been conducting research with essential oils for more than 15 years. She holds a Bachelor’s degree in Technical Writing and a Master’s degree in Botany and Integrative Biology from Brigham Young University. Nicole has worked in quality control laboratories in the nutraceutical industry as well as academic research laboratories at the University of Utah and the University of Nevada Las Vegas Cancer Research Institute. In addition to research, she has taught courses in chemistry and biochemistry at Brigham Young University – Idaho and University of Nevada Las Vegas. Nicole is dedicated to advancing our understanding of essential oils through research and education.


Alex M. DaBell, M.S.

Senior Scientist, Nutraceuticals

Alex DaBell is the principal scientist for development of dōTERRA’s nutritional products. He holds a Master of Science in Physiology and Developmental Biology from Brigham Young University. With nearly a decade of industry experience, Alex is well qualified to lead the development of some of the highest-quality nutritional products available anywhere. He enjoys learning about new discoveries in nutrition and brainstorming how those discoveries might make their way into new and existing dōTERRA products. Alex, his wife Lisa, and their three children enjoy the outdoors, making beautiful music, and trying out new recipes.


Jeff Dorsett, MSHS

Research and Development Scientist

Jeff holds Master of Science in Health Sciences degree and has over 10 years dietary supplement industry experience in research and product development. Jeff is motivated, task-oriented, and efficient, and his knowledge of the dietary supplement industry is comprehensive and current. He is highly skilled in literature reviews, evaluating scientific research for product development and claims substantiation, and is well versed in the regulations that govern the food and dietary supplement industries. His unique experience and skillset allows him to successfully combine science with regulatory compliance.


Thao Le

Senior Research and Development Scientist

Thao has a love of science as demonstrated through her work on Personal Care and Household products for over sixteen years. Prior to joining doTERRA in January 2015, she has been instrumental in creating world class products for Arbonne, Nu Skin, Neways, Dr. Perricone, Pfizer, Procyte, Pharmacia Upjohn and many more at Sorenco Laboratories. Her experience in working as an Analytical Chemist at Weider Nutrition International for over eight years gave her key insights into cosmetic product formulation. She is passionate about making the best product using the most innovative, safe ingredients and enjoys seeing the satisfaction from Wellness Advocates eyes after testing our products. Thao earned a Bachelor of Science in Chemistry from the University of Utah in 1999. She has been a part of the Intermountain West Society of Cosmetic Chemists and served as secretary.


Damian Rodriguez

Health and Exercise Scientist

Dr. Damian Rodriguez has spent most of his life researching nutrition, exercise, and the lifestyle behaviors associated with optimal wellness. Prior to joining dōTERRA, he worked in public health and as a strength coach and nutritionist to professional and collegiate athletes. He holds a doctorate in Health Sciences from A.T. Still University, where he focused his research on obesity and completed his dissertation examining national trends in obesity comorbidities. He also holds a master’s of Science in Exercise Physiology with an emphasis in athletic performance, a bachelor’s in Nutritional Science, as well as numerous professional certifications in exercise and nutrition. Dr. Rodriguez is a lifelong athlete who has competed in everything from powerlifting to triathlons. Along with his interest in health, he is also passionate about bringing awareness to autism spectrum disorders. Living with Asperger’s Syndrome himself, along with having served as a mentor to autistic teens, Dr. Rodriguez has written and spoken about his experiences being a husband and father with an autism spectrum disorder.


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