John Muir Concord Medical Center
John Muir Walnut Creek Medical Center
Stanford Health Care Valley Care
Dr. William Longton trained at Stanford University where he participated in a number of studies related to how pain affects the human body. After completing his residency and fellowship in anesthesiology and pain medicine, Dr. Longton stayed on as faculty at Stanford Medical Center attending the operating rooms and the pain clinic. He trained and taught side by side with some of the original leaders in the field of pain therapy. He has held leadership positions in the field of pain management at Stanford University, Santa Clara Valley Medical Center and John Muir Hospital. Dr. Longton rose to a position of national excellence with his implementation of advanced pain medicine and regional anesthesia techniques. He has almost 20 years of experience being board certified in both anesthesiology and pain medicine. He has expertise in multidisciplinary care, cancer pain management, spinal cord stimulation and spinal medication delivery systems. A previous world-class athlete and finalist in the US Olympic Trials in swimming, Dr. Longton is an avid cyclist, skier, and windsurfer.
Dr. Audrey "Lisa" Arzamendi is double board-certified in internal medicine and endocrinology. Since 2012, she has specialized in diabetes, obesity and metabolism, thyroid disease (including Hashimoto's and Graves'), polycystic ovary syndrome (PCOS) and sex hormone disorders, adrenal and pituitary dysfunction, osteoporosis, parathyroid/calcium disorders, and thyroid and parathyroid nodules and cancers. She is highly trained in ultrasound-guided fine-needle aspiration (FNA) biopsy of the thyroid (99% diagnostic rate).
Dr. Arzamendi is committed to safe and established medical treatments, and prides herself on staying informed about emerging therapies and research-supported non-prescription options. She is experienced working with all forms of brand-name and generic thyroid medications, and as a type 1 diabetic herself, has first-hand knowledge of nearly all available prescription and technological diabetic treatments, to best support patients in selecting their optimal diabetes treatment regimens.
Dr. Arzamendi graduated with honors from Stanford University, with a BA in Human Biology and a concentration in Health & Human Performance. She attended UC San Diego School of Medicine (receiving a federal NIH National Cancer Institute fellowship), and completed her internal medicine residency at Kaiser Pemanente’s Santa Clara Medical Center. Her endocrinology training was completed at UC Davis Medical Center. She previously practiced in California's South Bay before relocating to open her practice in Walnut Creek in 2020. Dr. Arzamendi was a Stanford varsity athlete and still enjoys running, hiking, tennis, rowing, and other outdoor activities. She loves spending time with her husband and many pets, and looks forward to being your doctor!
Medical School: University of Arizona College of Medicine in Tucson
Internship: St. Mary’s Hospital in San Francisco, California
Residency: Stanford University School of Medicine in California
Fellowship: Stanford University School of Medicine in California