At Longevity Medical Clinic, we redefine what it means to grow older by empowering individuals to thrive at every stage of life.
We provide personalized care to boost health, energy, mood, and vitality while reducing the risk of serious diseases like heart disease, cancer, diabetes, and more.
We believe that a truly extended lifespan should be accompanied by excellent health and abundant joy. Our integrated approach aims to help you achieve not just a longer life, but a richer, more fulfilling one.
Our Leadership
Dr. Jerry Mixon
Dr. Jerry Mixon, founder of the Longevity Medical Clinic, holds a B.S. in Microbiology and an M.D. from the University of Utah. Board-certified in Family Practice and licensed in Washington State, Dr. Mixon spent 23 years in general practice before embracing longevity medicine. In 1998, he established his clinic to offer more comprehensive, personalized healthcare focused on optimal health and vitality at any age.
Dr. Samira Ummat
Dr. Samira Ummat brings a wealth of international experience to her practice, holding Washington State and British Columbia licenses. After earning her Bachelor of Medicine and Surgery from Delhi University in India, she completed residencies in Physical Medicine and Rehabilitation at Dalhousie University in Canada and Family Medicine in South Carolina. As a Fellow of both the American Academy of Anti-Aging Medicine and the Royal College of Physicians and Surgeons of Canada, Dr. Ummat's expertise combines rehabilitation, family medicine, and anti-aging practices.
Dr. Christine Brassell
Dr. Christine Brassell is a licensed Naturopathic Doctor in Washington State. She earned her Doctorate from Southwest College of Naturopathic Medicine and holds a BA in Sociology/Anthropology from Ohio Wesleyan University. Dr. Brassell's experience includes roles in medical spas, wellness clinics, pain management, and hospice care. Her expertise in natural medicine and botanical therapies enables her to provide patients with holistic, natural healthcare solutions.
Dr. Ken Pentland
Dr. Ken Pentland is a licensed Naturopathic Doctor in Washington State. He holds a dual Doctorate in Naturopathic Medicine and a Master's in Acupuncture and Oriental Medicine from Bastyr University, including specialized herbal medicine training in China. His experience includes senior roles in IBS treatment, integrative pharmacy, and men's health clinics.
Dr. Irina Riabikina
Dr. Irina Riabikina is a licensed Naturopathic Doctor in Washington State and Arizona. She holds a Doctorate in Naturopathic Medicine from Southwest College of Naturopathic Medicine and a medical degree from Russia. Her experience covers naturopathic clinics and internal medicine. Dr. Riabikina combines conventional and naturopathic approaches, specializing in comprehensive pain management and anti-aging medicine.
Dr. Nathaniel Armstrong
Dr. Nathaniel Armstrong, a licensed Naturopathic Physician in Washington State, holds a Doctorate from Southwest College of Naturopathic Medicine and a B.S. in Psychology from San Diego State University. His diverse clinical experience includes primary care, family practice, and women's health. A member of multiple professional associations, Dr. Armstrong integrates conventional and naturopathic approaches in his practice.
Dr. Jake Felice
Dr. Jake Felice is a licensed Naturopathic Doctor in Washington and California, also certified as a Licensed Massage Practitioner in Washington. He holds a Doctorate from Bastyr University and a BA in Psychology from Penn State University. Dr. Felice's career combines clinical practice with academic roles, teaching at Bastyr University and other institutions. He is also the founder of Sweetwater Holistic, LLC, where he applies his expertise in natural product formulation.
Dr. Kisoon Cho
Dr. Kisoon Cho joined Longevity Medical Clinic in 2007. She earned her medical degree from SUNY Health Sciences Center at Stony Brook and completed her residency in Family Medicine at St. Joseph's Medical Center. Dr. Cho's diverse career includes work with Indian Health Services, nationwide locum tenens, and extensive experience with Group Health. Board-certified in Family Practice since 1988, she brings a wealth of experience to her current role.
Dr. Laura Chimenez
Dr. Laura Jimenez is a licensed Naturopathic Doctor in Washington State. She earned her Doctorate from Southwest College of Naturopathic Medicine and holds a BS in Biology from the University of Nebraska at Omaha. Dr. Jimenez has worked as a staff physician at wellness centers, bringing her naturopathic expertise to patient care. Dr. Jimenez specializes in women's health, focusing on areas such as hormonal balance and preventive care tailored for women throughout all life stages.
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