Dr. Shelby has lived in and been in private practice in the East Bay Area for the last 20 years. He offers a variety of services including Reflux disease and Barrett’s esophagus management, bowel disorders and colon cancer screening, pancreatic disorders and bile duct diseases, and non-surgical balloon weight-loss interventions. Dr. Shelby received his medical degree from Jordan University and his internal medicine training from Brown University. He completed a gastroenterology fellowship at the University of Texas in Galveston. He was recruited to complete an Advanced Interventional fellowship at the combined Massachusetts General Hospital and Brigham and Women’s Harvard Gastrointestinal advanced fellowship because of his interest in advanced patient care and new innovations in gastrointestinal cancer prevention, pancreatic disorders, and bile duct disorders. He also served as an adjunct faculty at Stanford GI division. Dr. Shelby strives to offer comprehensive compassionate patient care along with his same staff for the last 15 years. He performs his procedures at the Executive Surgery Center, a friendly and family-oriented surgery center in the Danville area. He’s also on the medical staff at local hospitals such as San Ramon Regional Medical Center and John Muir Hospital
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: Jordan University Medical School in Amman, Jordan
Residency: Internal Medicine at Brown University in Providence, Rhode Island
Fellowship: Gastroenterology at the University of Texas in Galveston, TX