STEVEN HARRIS, M.D.

Steven Harris, M.D. has been in private practice since 2001. Dr Harris is a medical doctor (MD), board certified in Family Practice. His private practice was opened as a sole proprietorship until 2006, after which he formed a California medical corporation, Pacific Frontier Medical, Inc.

Since 2001 Dr Harris has focused his practice on the diagnosis and treatment of Lyme disease and other tick-borne co-infections. In his approach to Lyme disease he incorporates strategies found in conventional, functional and complimentary medicine. He believes that there are many effective treatments available to those with chronic and persistent Lyme.

Dr Harris has taken a leadership role in lymedisease.org (formerly CALDA -The California Lyme disease Association), a research, patient advocate group which has been largely responsible for spearheding favorable legislation protecting patients rights, expanding Lyme disease awareness and fostering continued public health education. Dr Harris is also an active member of ILADS (The International Lyme and Associated Diseases Society). This is a professional medical society of physicians and scientists which has become the authority on effective treatment for chronic Lyme disease.

YVONNE LIN SORENSON,  PA-C

Yvonne Lin Sorenson, PA-C received her Masters in Physician Assistant Studies (MPAS) at Touro University.  Since joining Pacific Frontier Medical in June 2007, she has been trained by Dr. Steven Harris and continues to works closely with him and everyone at the practice.  Yvonne has become very knowledgeable in the methodologies and treatment protocols of Lyme disease and tick-borne co-infections.  She has also grown more active in research, currently the Project Director for a study being conducted at Stanford University.  The study titled Immune Responses and Symptoms in Lyme Disease Patients and Healthy Controls looks at diverse manifestations of Lyme disease.

The Physicians Assistant profession continues to be one of the fastest growing professions. PAs work under a supervising physician and can obtain medical histories, conduct physical exams, order and interpret tests, diagnose and treat illnesses, prescribe medications, counsel on preventative health care and assist in surgery. More information about Physician Assistants can be found at aapa.org

MISCHA GRIEDER, N.D.

Dr. Mischa Grieder received his medical training at Bastyr University in Seattle, WA, the leading academic institution for education, research and clinical service in natural health sciences.  In addition to his doctoral degree, Dr. Grieder holds a Bachelor of Science in Biochemistry.  He is a member of the American Association of Naturopathic Physicians, the California Naturopathic Doctors Association, and ILADS: the International Lyme and Associated Diseases Society.  Besides practicing medicine, he is an adjunct professor for Biomedical Sciences at the American College for Traditional Chinese Medicine in San Francisco.

Dr. Grieder is a licensed medical provider in the State of California and offers both conventional and alternative therapies to patients seeking contemporary, scientific, and comprehensive health care.  A friendly and honest relationship with his patients builds the foundation for Dr. Grieder’s practice. 

Born and raised in a large and lively family on an organic farm near Zurich, Switzerland, Mischa Grieder was  exposed to natural medicine and a holistic lifestyle at a young age.  His upbringinging was marked by a Waldorf education and a home where friends of diverse backgrounds enriched vivid dinner conversations. He is fluent in both German and French, and continues to study in Switzerland, allowing him to investigate and draw from a host of European research and excellence in health care. 

Dr. Grieder has been treating patients with Lyme disease since he began his practice in California and has trained with esteemed Lyme literate physicians.  Drs Harris and Grieder collaborate as they treat patients with Lyme while continuing to develop advanced therapeutic protocols that effectively and safely address tick-borne and related diseases.


JENNIFER SUGDEN, N.D.

“Each person who walks through our clinic is as unique as their fingerprints. What may work for one individual is not what will work for another. It is only by truly listening to their story that together we can discover the path that best leads them to restored health.”

“I approach every patient with both short-term and long-term goals. The short-term goal is to reduce current symptoms and to improve immediate health. This is usually achieved by addressing a patient's lifestyle, such as nutrition, habits, body mechanics, and psychological outlook. The long-term goal is to discover and treat the underlying cause of the dysfunction, and to prevent future disease. This goal is achieved through understanding a patient's genetics, personal health history/traumas, and the relationship of all the body's systems and their intricate connections.”

Before coming to PMF in early 2013 Dr. Sugden had a private medical practice in Portland for 10 years where she worked a lot with hormone and endocrine disorders as well as Lyme disease.  She enjoys the group setting and working with the other physicians in this practice for the good of all of our patients.

Dr. Jennifer Sugden received her medical training at The National College of Naturopathic Medicine in Portland, OR. In addition to her doctorial degree, Dr. Sugden holds a Bachelor of Science in Chemistry. She is a member of the American Association of Naturopathic Physicians, the California Naturopathic Doctors Association, American Autism Association and ILADS.