Dr. Ryan Christensen, DO is a board-certified osteopathic physician practicing Traditional Osteopathy, Osteopathic Manipulative Treatment, and Integrative Medicine in Lake Orion, Michigan. He completed a dual residency in Family Medicine and Emergency Medicine in 2017 at McLaren Oakland Hospital. Of particular relevance to Long COVID and ME/CFS patients, Dr. Christensen offers The Perrin Technique — a manual lymphatic drainage technique developed for ME/CFS — and conducts Cranial Bootcamp masterclasses. Other services include osteopathy in the cranial field, craniosacral therapy, auricular battlefield acupuncture, trauma-informed care, and clinical hypnosis.