top of page







Dr. Leslie DeGasparis, N.D.



Patients often come to Dr. Leslie after seeing several doctors for hormone, thyroid and nutrition issues and have still not found any resolution to their health concerns. Dr. Leslie is known for being a great listener, a tenacious researcher and analyst, a true advocate for her patients and for giving them the tools needed so they can be in the driver’s seat when it comes to accomplishing their health goals.


She helps patients with thyroid and related hormonal imbalances that can occur for many reasons. She takes into account adrenal and reproductive hormones, as well as the thyroid hormone balance for optimizing her patient’s health. She works with both men and women, and also often helps significantly with infertility issues, pregnancy and postpartum issues, as well as menopausal hormone imbalances. She is also an expert in identifying if undiagnosed hypothyroidism is a primary cause of infertility issues for her patients, as it often is, and is often missed by fertility specialists. She can work closely with a patient’s primary doctor including a patient’s Ob-Gyn to help consult and combine efforts to create the best solution for long-term health.


In Dr. Leslie's Words

“My philosophy is that standard testing does not show the whole, definitive picture – I take the time to get to know your health goals and concerns, do thorough and detailed testing and then together create a plan that gets you results. It has been very rewarding over the years to collaborate with all my patients to help find the answers they have been seeking. I am highly dedicated to personalized and comprehensive care and the outcomes that can significantly improve your life. I like having a partnership with my patients - I have the medical knowledge and you have your own personal knowledge – so combined we are able to get to the root of any health issues you are experiencing.” 


About Dr. Leslie

Dr. Leslie earned her bachelor’s degree from the University of Washington and her doctorate degree from Bastyr University, the leading innovator in natural health education. She has since dedicated her practice to the master gland or as it is commonly referred to thyroid health. She enjoys running, gardening, spending time with family and continuing to learn more about the thyroid health. In addition to the degrees earned, she has also achieved several certifications to gain more information on how she can help her patients:


  • Member of the ATA (American Thyroid Association)

  • Firstline Therapy Certification in Therapeutic Lifestyle Interventions

  • Certification in Functional Blood Chemistry Analysis

  • Certification Functional Endocrinology

  • Certification in Mastering The Thyroid

  • Certification in Advanced Food Allergies, Intolerances & Sensitivities

  • Certification in Functional Neurotransmitter Balance & Brain Health



"I have devoted my
practice to ensuring my
patient's thyroid health."

Based on extensive research and over 15 years of clinical experience, I've found that over 2/3 of thyroid cases go undiagnosed due to inadequate testing techniques in standard medical practices. Also, most patients who have been diagnosed are receiving inadequate treatment leading to less than an ideal quality of life.



Dr. Summer Baptist, ND, MPH, L.Ac.


Dr. Summer Baptist is an experienced and respected naturopathic physician with more than 18 years’ clinical experience in integrative medicine.  She has experience as a lead provider of functional endocrinology, medical director for women’s health, hospital oncology programs, and CDC public health prevention programs. She has also been providing care for thyroid health including managing care for thyroid cancer patients and cancer survivors before, during and after treatment. She is also a skilled Diplomate practitioner of Traditional Chinese Medicine with experience in integrating eastern and western medical philosophies.


Dr. Baptist has a special interest in Bioidentical Hormone Replacement Therapy (BHRT) and research and is considered an authority in finding safe, effective strategies for hormonal issues with training in bioidentical hormone replacement therapy (BHRT) with the Women’s Hormone Network. She is known for personalizing BHRT treatments for both men and women according to patients’ medical history, current lab work and up-to-date evidence-based research. Dr. Summer utilizes her training in Physiological Restoration with bioidentical hormones to help regulate, treat, and prevent women’s health conditions such as osteoporosis, painful and irregular periods, perimenopause and menopausal symptoms such as hot flashes, brain fog, hair loss, weight gain, anxiety with mood changes, and sleep disturbances.


She is best known for connecting with her patients, actively listening, and partnering with them to provide safe, effective treatment plans with the objective of thriving, not just surviving.


Her hobbies are sailing, surfing, hiking, sprint triathlons, yoga, and cooking.




Bachelor of Science (BS), Natural Health Sciences, Nutrition, Bastyr University

Master of Science (MS) Acupuncture and Oriental Medicine Institute of Clinical Acupuncture and Oriental Medicine - Honolulu, HI

Master of Public Health (MPH) University of Massachusetts

Doctor of Naturopathic Medicine (ND) The Canadian College of Naturopathic Medicine



Functional Endocrinology: Connecting New Research with Practical Applications, Apex Seminars

Women’s Hormone Network: Physiological Restoration with Bioidentical Hormones

Northwest Natural Health - leadership positions:

Integrative Medicine Adjunctive Oncology Lead Provider

Integrative Medicine Medical Director, Women’s Health

Certificate of Global Health, University of Massachusetts

CDC: Division of Global Migration & Quarantine – Public Health Advisor

State of Hawaii Public Health – Outbreak Control Division – Epidemiological Specialist

Acupuncturist Without Borders: Healing Community Trauma Certification

Hospital and Cancer Center leadership positions include:

Lead Project Manager, Integrative Naturopathic Oncology – Cancer Survivorship & Inpatient Dpt

Naturopathic Representative, Prostate & Breast Cancer Steering Committees


We hope you take a moment to meet and to work with Dr. Baptist on your health concerns at Seattle Advanced Thyroid Health. She is accepting new patients.

bottom of page