dōTERRA’s Scientific Experts


Dr. David Hill, D.C.

Founding Executive, Chief Medical Officer and Chairman, Scientific Advisory Committee

For many years Dr. David Hill, D.C. has utilized the benefits of essential oils in modern health practices, and as a physician he is a well-known expert in essential oils and integrative medicine. Dr. Hill partners with physicians and hospitals around the world defining and establishing the medical integration and use of essential oils in modern health practices. He fosters education and advances in essential oil science through a number of university and research affiliations providing cutting edge science for essential oil users. He is a frequent guest on many radio and television shows and has authored a number of books and other publications. Dr. Hill stands at the head of a new era dedicated to empowering others to take control of their own well-being.


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 doTERRA’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 doTERRA 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.


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