Scientific and Medical Education Committee

Dr. David Hill

Founding Executive

Dr. Hill oversees all science, research, medical, and safety departments at doTERRA. He’s known across the world as an expert in essential oils and integrative medicine. 

Dr. Hill, a pioneer and leader, has been a pivotal force for bringing essential oils into the mainstream over the past several decades. He partners with international physicians, scientists, and hospitals, defining and establishing the medical integration and use of essential oils in modern health practices. He guides advances in essential oil science at top universities and research affiliations, helping provide more in-depth understanding of essential oils and their uses. 

Along with his many accomplishments in essential oil science and research, Dr. Hill is also a beloved educator. At the end of the day, his favorite way to spend his time is at home with his wife, children, and grandchildren. 

Dr. Russell Osguthorpe, MD

CMO, (Chief Medical Officer)

Dr. Russell Osguthorpe currently serves as chief medical officer at doTERRA. He’s establishing a network of primary care clinics focused on wellness and prevention through integrative, evidence-based medical practices. He’s also researching the use of essential oils in healthcare settings.

Dr. Osguthorpe received his medical degree from the McGill University School of Medicine, completed his residency at the Children’s Hospital in Denver, Colorado, and pediatric infectious diseases fellowship at Washington University School of Medicine.

Dr. Brannick Riggs, MD

Vice President of Education, Chairman of Scientific and Medical Education Committee

Dr. Brannick Riggs was born in Lafayette, Indiana, but he was raised around the world. He’s a board-certified family practitioner. In 2001, he graduated from the University of Arizona College of Medicine in Tucson, receiving some of his training in complementary and alternative medicine. After graduation, he participated in the McKay-Dee Family Practice Residency program, which brought him and his family to Ogden, Utah.

Dr. Riggs enjoys the full spectrum of family medicine and is a member of the American Academy of Family Physicians. Dr. Riggs served as medical director of his busy practice, as well as for a nursing home and two hospice groups. He was also the northern Utah medical director for Revere Health from 2014 to 2017.

Dr. Riggs has a strong interest in value-based healthcare and is passionate about changing the profession he loves for the betterment of patients and physicians. He was honored to receive the Patients’ Choice Award for seven consecutive years. He’s now chairman of the Scientific and Medical Education Committee and vice president of clinical initiatives for doTERRA.

Dr. Riggs enjoys using essential oils in his home and integrating them into his medical practice to bless the lives of patients. When he’s not working, Dr. Riggs and his wife, Juli, enjoy spending time with their five children out in the Wasatch Front. They garden, tend to their small farm, and love to travel the world together.

Dr. Katherine Igah-Phillips MD, MHA

Integrative Medicine

Dr. Katherine Igah-Phillips—affectionately known as Dr. K—is an award-winning international speaker and holistic humanitarian. She focuses on the power of mental, physical, emotional, and spiritual wellness.

Dr. K uses her private integrative medicine practice to provide her community with holistic, natural, and authentic medicine, delivered by a team of like-minded practitioners. She also offers a virtual mentorship program, where she creates space for personal development and elevation of consciousness. Dr. K maximizes her life’s purpose by providing necessary tools and coaching for people to access genuine wellness, holistic elevation, and a fulfilling reality.

Dr. Jessica Herzog MD, FAAP, ABOIM

Dr. Jessica Herzog is a leader and teacher in the field of natural healing. She serves on the medical boards of Synergy Science and Infinity Medica. She’s the founder of Blue Pebble Health, an integrative and functional medicine center with locations in Utah and Pennsylvania. Her mission has always been to help others advance on their wellness journeys by uncovering what’s holding their health back. Her team of natural-minded practitioners specialize in recovery from chronic fatigue, autoimmune conditions, digestive concerns, and hormone imbalances. Dr. Herzog’s health philosophy is simple: optimize mitochondrial or cellular energy and provide foundational nutrients. This approach has worked for optimization, recovery, and prevention.

Dr. Herzog is dual board-certified and completed her undergraduate degree, medical doctorate, and pediatric residency at the University of Maryland. During her studies, she participated in research teams at the National Institutes of Health and the University of Maryland. She started her career as a pediatric hospitalist, serving in Maryland, Utah, and Pennsylvania. For the last 10 years, Dr. Herzog has exclusively worked in natural medicine, acknowledging the power of time-honored herbal and essential oil traditions. She’s also a champion of cutting-edge health technologies, which stimulate cellular energy and pair perfectly with traditional approaches.

Dr. Herzog whole-heartedly practices what she teaches, striving for the optimal balance of physical, mental, emotional, and spiritual wellness. She uses essential oils daily as part of her personal routine, taking them internally (her go-to method), diffusing, and applying topically. She lives in Utah with her family of six children.

Dr. Amy Wolthoff, MD

Dr. Amy Wolthoff grew up in Grapevine, Texas (a suburb of Dallas). In 2009, she received her doctor of medicine degree from the University of Texas Health Science Center in San Antonio. Dr. Wolthoff completed her internship year in internal medicine at Texas Health Resources Presbyterian Hospital in Dallas. She then joined the Department of Dermatology at the Texas Tech Health Science Center in Lubbock, where she received the Resident Leadership Award, which recognizes superior leadership qualities, professionalism, teamwork, and dedication in the residency program. She completed her dermatology board exam and became board-certified in July 2013.

Since starting in private practice in Dallas, Dr. Wolthoff has received many awards from her patients and peers, including “Three Best-Rated Dermatologists in Dallas” in 2016, “Texas Rising Stars” from 2014 to 2017, “Top 10 Doctors” in 2015, “Most Compassionate Doctor” from 2013 to 2017, and “Patient’s Choice Award” from 2013 to 2017.

Dr. Andrew Gough, DO

Dr. Andrew Gough was born and raised in England to parents who both practiced medicine and believed in the effectiveness of alternative medicine. He completed a sports science degree from Chelmsford College before moving to the US, where he studied psychology and chemistry at BYU–Idaho, graduating with honors. Dr. Gough then graduated from the founding school of osteopathic medicine, Andrew Taylor Still University, and completed his residency in emergency medicine at the St. Joseph hospital system in Detroit, Michigan.

Dr. Gough currently practices emergency medicine at Sanford Hospital in Aberdeen, South Dakota. He’s passionate about learning, studying, and educating people about the many health benefits provided by doTERRA essential oils and natural products and is dedicated to sharing how they’ve blessed his family and continue bringing hope and healing to so many people worldwide.

Dr. Chris Spelman DDS
克里斯·斯佩爾曼博士

克里斯·斯佩爾曼博士是新澤西州一家私人診所的牙醫，為病人提供全方位的牙科服務。他於2001年以優異成績畢業於馬里蘭大學，並且是美國綜合牙科學院的成員。他專注研究精油，並將其應用於牙科實踐中，熱衷於幫助病人和同事了解健康生活方式的重要性。

Dr. Ashley Anderson NP with PhD
艾希禮·安德森博士，護理師，擁有哲學博士學位

艾希禮·安德森博士於2008年獲得路易斯維爾大學護理學理學碩士學位，專攻婦女健康護理；2012年獲得健康專業教育證書；2016年獲得護理學哲學博士學位。她於2005年在貝里亞學院獲得護理學理學學士學位，曾擔任貝里亞學院女子籃球隊隊長，並創下紀錄。在追求學業的同時，她參加選美比賽以爭取額外的獎學金機會，贏得了2013年美國肯塔基州小姐、2010年俄亥俄州黑人小姐的稱號，並在2008年選美比賽重返校園47年後，加冕成為第一位路易斯維爾大學小姐。

安德森博士是雅典娜健康與福祉中心（Athena Health and Wellness）的創始人兼首席執行官，這是肯塔基州路易斯維爾市首個專注於婦女健康的診所。她於2020年與 doTERRA 合作，開展精油事業，促進西方醫學的自然健康護理。作為計劃生育專家、研究員、作家及演講者，她致力於社區服務。

安德森博士曾獲得多項榮譽，包括2016年的蓋伊·史蒂文森研究生卓越獎。她是肯塔基州黑人小姐獎學金組織的執行董事，致力於賦予年輕黑人女性力量。她與兩個兒子阿特拉斯和艾斯居住在路易斯維爾地區。

Dr. Janet Roark 珍妮特·羅克博士

珍妮特·羅克博士是一名獸醫，也是德克薩斯州奧斯汀市山地移動獸醫服務的擁有者。她在俄亥俄州芬德雷大學獲得生物學、馬術研究和獸醫學預科三項學士學位，並於2005年畢業於密歇根州立大學的獸醫學院。

在面對身體和情緒的挑戰後，羅克博士開始使用精油療癒自己，並逐漸將其融入獸醫實踐中。她專注於將針灸和精油與傳統治療方式相結合。

羅克博士致力於分享 doTERRA 精油的安全有效使用方法，以便治療動物。

Dr. Jeanette Yamamoto
詹妮特·山本博士

詹妮特·山本博士於1997年在俄克拉荷馬州立大學榮獲動物科學學士學位，並於2002年獲得獸醫學博士學位。畢業後，她回到加州，完成了小型動物就醫實習，並在洛杉磯的動物專科和急救中心擔任高級急救和重症監護臨床醫生直到2012年。2011年，詹妮特創立了Peaceful Pets安寧寵物居家安樂死服務，確保她所在地區的狗和貓能夠安然離世。她將精力集中於業務擴展，將安寧療護和臨終關懷納入服務範疇，並於2020年10月獲得獸醫臨終關懷和保守療法證書。

在2014年12月通過介紹認識doTERRA精油後，詹妮特迅速成為健康倡導者，並將精油納入她的綜合醫療和居家安樂死服務。精油顯著改善了她許多病人的生活質量，並成為她醫療實踐中的重要一環。

詹妮特目前居住在南加州的聖克拉裡塔山谷，與丈夫傑里米和兩個孩子艾莉及賈斯汀共同生活。他們的家庭還有幾隻寵物，包括一隻名叫Boxsie的貓、一隻鬥牛犬混種Bella、一隻約克犬混種Phoebe和一隻迷你品犬混種Zero。

Dr. Mia Frezzo 米婭·弗倫佐博士

米婭·弗倫佐博士是一位居住在新澤西州北部的獸醫，同時也是一位妻子和三個孩子的母親。她對獸醫學的熱情源於她的叔叔——一位同樣的獸醫，從14歲起她便開始跟隨叔叔學習和工作。1998年，米婭從俄亥俄州立大學獸醫學院畢業，隨後回到家鄉發展她的職業生涯。

目前，她是位於新澤西州哈斯布魯克高地的哈斯布魯克高地動物醫院的擁有者和醫療總監。弗倫佐博士的病患動物受益於她所推崇的綜合性治療方法，尤其是在doTERRA精油、天然健康和疾病預防方面。

她深信精油的力量，這源自她自己的親身經歷。當她的女兒面臨健康挑戰時，她感到非常沮喪，卻發現doTERRA的順暢呼吸和保衛複方對女兒的健康大有裨益。

弗倫佐博士自豪且自信地與家人、朋友及客戶分享doTERRA天然精油和產品的好處，無論是在美國還是國外。當她目睹生病動物在身體和情緒上有顯著改善時，她寫下了《SpOIL 您的寵物：貓狗精油的實用指南》一書，與更多人分享這些經驗。

Dr. Larry McCaskill DVM, CVA, CVCH, CVFT, CVTP, CTCVMP
拉瑞·麥卡斯基爾博士

麥卡斯基爾博士在路易斯安那州的巴吞魯日郊區長大，並在路易斯安那州立大學獲得本科學位。1970年，他被任命為美國空軍（USAF）少尉，成為戰鬥機飛行員，並服役至1977年。隨後，他進入LSU獸醫學院學習，並在1981年獲得獸醫學位。同年，他在路易斯安那州的新路創立了麥卡斯基爾獸醫醫院，這是一家提供混合動物診療服務的診所。

他對獸醫針灸和中國傳統獸醫學（TCVM）的興趣始於佛羅里達州雷迪克的氣研究所。麥卡斯基爾博士於2009年成為經認證的獸醫針灸師（CVA），並獲得中國傳統獸醫學執業醫師（CTCVMP）的資格，涵蓋針灸、中藥、食品療法和推拿等領域。

他將doTERRA精油療法融入動物治療中，並熱衷於推廣中國傳統獸醫學，還指導學習獸醫針灸的學生。作為氣研究所的講師，他也在中國教授針灸知識。

麥卡斯基爾博士與妻子露及他們的黃色拉布拉多犬Cakki居住在路易斯安那州奧斯卡市。他們育有兩個孩子馬特和梅根，以及五個孫子女，並活躍於新道路的聖瑪麗天主教堂。他的興趣包括健身和與Cakki一起打鴿子和鴨子。

Dr. Janis Fisher DVM, CVA, CCRT, CAC 賈妮思·費舍博士

賈妮思·費舍博士畢業於加拿大愛德華王子島的大西洋獸醫學院。她在職業生涯的早期便意識到可以通過更全面的方法來獲得健康，因此於2005年通過國際獸醫針灸協會成為合格的獸醫針灸師，並開始融合針灸與傳統中醫草藥治療。

作為經認證的犬類康復治療師和動物脊椎按摩師，賈妮思對天然解決方案的追求使她接觸到doTERRA精油。她在家中親眼見證了精油的療效後，決定將其納入她的獸醫康復實踐。如今，她的診所每日都在擴香doTERRA精油，並熱衷於與同事分享精油對動物病症的益處。