Dr. Stephen Sims is an established board-certified family practice physician, with over 19 years of experience treating families. With a background in neuroscience research, he employs an analytical approach to patient care and has a special interest in restoring the forces within the body that influence health, and a sense of well-being. In line with this, he is passionate about understanding in depth the physiology of health and disease to better care for his patients, and partner with them to make lasting health improvements. While adhering to conventional, established standards of medical care, Dr. Sims augments these standard approaches to disease to allow a broader and more accurate picture of the multiple factors underlying chronic disease and suboptimal health by incorporating an evidence based personalized health assessment as part of disease diagnosis and prevention. “I am committed to understanding on a deeper level the physiology of health and disease to better understand why some diagnostic tests and treatments are better than others”. Dr. Sims attended college at Columbia University and graduated with a degree in Biology. Following graduation, Dr. Sims published basic neuroanatomy research and a human neurophysiology study abstract, attending medical school at Downstate University in Brooklyn in order to pursue a unique neuroscience research opportunity there. During this period, Dr. Sims realized that his passion was in the application of medical research in patient settings. He shifted focus and graduated from SUNY Downstate In 1989 with an M.D. degree. He completed residency in Family Medicine at University of Southern California.
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: Downstate University in Brooklyn, New York
Residency: Family Medicine at the University of Southern California