Dr. Welty enjoys practicing general urology, including urologic oncology (bladder, prostate, kidney, testis, and penile cancer), kidney stone disease, voiding dysfunction in men and women, as well as issues relating to men’s health such as erectile dysfunction, benign prostate enlargement and low testosterone/infertility.. He is fully trained in the endoscopic treatment of prostatic obstruction, stone disease and disorders of the upper urinary tract. He is also trained in penile prostheses, vasectomy, sacral neuromodulation, artificial urinary sphincters and slings. In addition, Dr. Welty has extensive fellowship training in surgical and clinical management of urologic cancers, including Da Vinci robotic, laparoscopic, and open surgical approaches. His prior research has focused on risk stratification, management, and outcomes of prostate and bladder cancers, including several papers on how to differentiate men with prostate cancer who need treatment from those who likely do not. Dr. Welty will be practicing in our Oakland office. He believes understanding each patient’s priorities, and helping them understand their diagnosis and treatment options, is the key to developing a personalized treatment plan care. Dr. Welty also enjoys golfing, cycling, skiing, and all outdoor activities, especially with his family and his dog.
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: Vanderbilt University School of Medicine
Residency: Urology – University of Washington School of Medicine
Fellowship: Urologic Oncology – University of California San Francisco