John Muir Health Walnut Creek Medical Center
John Muir Health Concord Medical Center
Sleep Medicine, Critical Care Medicine
Dr. MacDannald joined the Respiratory Medical Group in 1977 (which merged with BASS in early 2015). Dr. MacDannald continues to be an active member on both John Muir Health campuses in Walnut Creek and Concord. In the past, he served as vice chief of staff, chief of the medical staff, and post chief of staff for John Muir, Walnut Creek. Dr. MacDannald earned his Bachelor of Science in electrical engineering and his Bachelor of Arts in molecular biology from San Jose State University. He attended medical school at the University of California, Davis. He then completed his residency at Boston City Hospital through Boston University Medical Service and Wadsworth Veterans Administration Hospital through the University of California, Los Angeles. He completed a pulmonary fellowship through the University of California, Davis at the Veterans Administration in Martinez, 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:University of California Davis
Internship: Boston University in Massachusetts
Residency: Boston University in Massachusetts and Wadsworth Veterans Administration Hospital in Los Angeles, California
Fellowship: University of California Davis at Veterans Administration in Martinez