About ACT



We unite as the American College of Thyroidology because we believe that thyroid care needs to improve. Our mission is for people to have the chance to fully recover from thyroid illness. 


We believe that the best path to recovery combines both conventional and lifestyle medicine in one unified approach. We believe that personalized patient care should be driven by both scientific evidence and clinical experience. We will educate and train the next generation of thyroid leaders to help us attain the mission.

Our Values


Each Patient 

Their quality of life is our top priority 

Individual needs - help apply studies about group outcomes to become relevant to individuals

Safety - help patients consider the long term results of all medical decisions


Create a community that values ongoing learning

Share best practices among members

Share insights from ACT with peers


Stay grounded in the process of scientific inquiry

Remain ready to evolve ideas in light of emergent evidence

Provide clarity through conflicting views by working to a deeper level of understanding


Draw inspiration from multiple perspectives: Patient advocate, Clinicians - conventional and integrative, Researchers, Allied health professionals

Seek community input

Share clinical experiences


Inspire the next thyroid leaders

Model our values within your communities

Meet the Board

Alan Christianson, NMD

Naturopathic Doctor | Phoenix, AZ

Alan Christianson, NMD is a Phoenix, Arizona-based Naturopathic Endocrinologist (FABNE) who focuses on the treatment of chronic thyroid disease.

Dr. Christianson was a member of the premier class of Southwest College of Naturopathic Medicine (SCNM) graduating in 1996. He has been actively practicing in Scottsdale since 1996 and is the founding physician behind Integrative Health. 

He is a New York Times bestselling author whose titles include The Metabolism Reset Diet, The Adrenal Reset Diet, and the forthcoming Thyroid Reset Diet.

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Brittany Henderson, MD, ECNU

Medical Doctor | Charleston, SC

Dr Henderson is board-certified in internal medicine and endocrinology, with advanced training in thyroid disorders, including Hashimoto’s thyroiditis, Graves’ Disease, thyroid nodules, thyroid cancer, thyroid ultrasound/biopsy, ethanol ablation, and advanced minimally invasive techniques. 

Originally from Cleveland, Ohio, she graduated in the top 10% of at her class at Northeastern Ohio Medical University, where she received the honor of Alpha Omega Alpha (AOA). She completed her endocrinology fellowship training under a National Institutes of Health (NIH) research-training grant at Duke University Medical Center. She then served as Medical Director for the Thyroid and Endocrine Tumor Board at Duke University Medical Center (2013-2015) and as Clinical Director for the Thyroid and Endocrine Neoplasia Clinic at Wake Forest University Baptist Medical Center (2015-2018).

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Nicole Anziani, MS, RD, CDN, CDCES, AWC, HHC, CPT

Registered Dietician | California

Nicole is a Registered Dietitian, Certified Diabetes Care and Education Specialist, Ayurvedic Wellness Counselor and certified personal trainer specializing in the management of thyroid conditions.  She received a BS in Nutrition and Dietetics from the University of California, Berkeley, and an MS from New York University. As a thyroid cancer survivor, Anziani’s passion and mission is to make nutrition care information for thyroid conditions easily accessible to practitioners and patients.  She is the author of The Health Professional’s Guide to Nutrition Management of Thyroid Disease; the first peer-reviewed, American Thyroid Association physician-reviewed, and evidence-based practice guidebook to instruct dietitians and allied healthcare professionals on medical nutrition therapy for thyroid disease, published by the Academy of Nutrition and Dietetics in 2020. The book is available from eatrightSTORE.org, Amazon.com, and from various CPE providers. Anziani creates free thyroid content as @thyroidnutritionist on Instagram. 

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Gary Clayman, DMD, MD, FACS

Thyroid Surgery | Tampa, FL

Dr. Gary Clayman is one of the most experienced thyroid surgeons and arguably the most experienced thyroid cancer surgeon in the world. Dr. Clayman is a fellow of the American College of Surgeons and the American Head and Neck Society. For 27 years, Dr. Clayman was the leading head and neck thyroid surgeon at the University of Texas M.D. Anderson where he served as the Distinguished Chair of Head and Neck Surgery and the Chief of Head and Neck Endocrine Surgery since 2003. Dr. Clayman remains a lifelong Professor Emeritus at The University of Texas M. D. Anderson for his career contributions to the field of Thyroid Surgery. Dr. Clayman has limited his practice to thyroid and thyroid cancer surgery for more than 23 years.

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Rachel Hill 

Patient Advocate | England

Rachel is the highly ranked and multi-award winning thyroid patient advocate, writer, blogger, speaker and author behind The Invisible Hypothyroidism. She has two books: 'Be Your Own Thyroid Advocate' and 'You, Me and Hypothyroidism'. Her thyroid advocacy work includes authoring books, writing articles, blogging and speaking on podcasts. Rachel has worked with The National Academy of Hypothyroidism, BBC, The Mighty, Yahoo, MSN, ThyroidChange and more. She is well-recognised as a useful contributor to the thyroid community and has received multiple awards and recognitions for her work and dedication.


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Leila Turner, NMD

Naturopathic Doctor | Phoenix, AZ

Dr. Turner is a licensed Naturopathic Doctor (ND), grew up in Northern California, surrounded by alternative medicine and Redwood trees. She graduated from the University of California, Santa Cruz, with a Bachelor’s in Biology and Psychology. In 2007, she co-founded the Naturopathic Medical Student Association. Upon graduating from Southwest College of Naturopathic Medicine (SCNM) in 2007, she was awarded the prestigious SCNM Student Leadership Award and the Daphne Blayden Award in recognition of academic excellence, compassion, and perseverance.

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