John Muir Health Hospital Walnut Creek Medical Center
John Muir Health Concord Medical Center
San Ramon Regional Medical Center
Dr. Joshua K. Au specializes in comprehensive, evidence-based care of the ear, nose, and throat in adult and pediatric patients. Dr. Au received his Bachelor of Science degree in Molecular, Cellular, and Developmental Biology from Yale University and received the Edgar J. Boell Prize from the department. Dr. Au received his M.D. degree from Yale School of Medicine and was recognized as the Esther Lim Memorial Scholar from the Chinese American Medical Society. Subsequently, he completed his residency training in Otolaryngology – Head and Neck Surgery at University of California at Los Angeles where he was awarded multiple accolades including the Cohen-Geller Award in Pediatric Otolaryngology, the American Academy of Facial Plastic Surgery Leslie Bernstein Resident Research Grant, and the Best Teaching Chief Resident Award. Dr. Au then moved to the East Bay to join Contra Costa ENT. He is expertly trained in all aspects of ear, nose, and throat disorders including sinus disease, allergy, sleep apnea, otologic dysfunction, thyroid and parathyroid disease, salivary gland disorders, head and neck cancer, as well as speech and swallow disorders. Dr. Au has authored multiple peer-reviewed publications in leading journals and speaks at national conferences on all aspects of otolaryngology. In addition, he is fluent in Spanish and Mandarin Chinese. He practices in Concord, Pleasanton and Brentwood, and is on staff at John Muir Hospital (Walnut Creek and Concord Campuses) and at San Ramon Regional Medical Center. In his free time Dr. Au enjoys cooking, going on hikes with his wife, and playing tennis with friends. Dr. Au is a conscientious, ethical, and caring person who will surely garner the trust and favor of patients and fellow colleagues. He is a highly skilled and experienced otolaryngologist practicing state-of-the-art, evidence-based treatment and compassionate care for his patients. Dr. Au whole-heartedly embraces the philosophy of the Contra Costa ENT practice and is committed to serving the Contra Costa and Alameda communities. Please do not hesitate to call us if you have any further questions about Dr. Au.
Dr. Brian Chin practices advanced laparoscopic, bariatric, and general surgery at BASS Medical Group’s Walnut Creek and Brentwood offices. Dr. Chin is an expert in advanced minimally invasive surgery, including robot-assisted surgery. Dr. Chin has special expertise in the treatment of Morbid obesity (laparoscopic sleeve gastrectomy, laparoscopic Roux-en-Y gastric bypass, laparoscopic adjustable band placement, and revisional bariatric surgery), Abdominal wall hernias (laparoscopic inguinal, incisional, and ventral hernia repair), Hiatal hernias and paraesophageal hernias, Benign and malignant conditions of the upper gastrointestinal tract, including gastroesophageal reflux disease (laparoscopic Nissen fundoplication), achalasia (laparoscopic Heller myotomy), and benign and malignant stomach tumors, Gallbladder disease (laparoscopic cholecystectomy)
Benign and malignant solid organ disease (laparoscopic splenectomy, adrenalectomy, and pancreatectomy), Benign and malignant conditions of the colon and rectum, such as diverticulitis, colon cancer, and rectal cancer (laparoscopic colectomy), Venous disease (varicose veins, venous insufficiency, and venous stasis wounds).
Dr. Brian Chin was born and raised in the Bay Area. After graduating from Acalanes High School in Lafayette he ventured cross-country to coastal Maine, where he graduated magna cum laude from Bowdoin College with a bachelor’s degree in physics and mathematics. From there, he went on to earn a master’s degree in applied physics from Columbia University. He earned his medical degree at the University of Michigan Medical School, then returned to California for his surgery residency at the University of California at San Diego, where he won the Department of Medicine’s Halasz Award for surgical consultation and the Department of Surgery’s Chairman’s Prize for teaching and service excellence. Additionally, he served as administrative chief resident. Following residency, Dr. Chin completed a fellowship in bariatric and advanced laparoscopic surgery at the University of California at San Francisco, working alongside world-renowned leaders at the forefront of laparoscopic surgery. Dr. Brian Chin is board certified in surgery by the American Board of Surgery and in advanced trauma life support by the American College of Surgeons. Dr. Chin also serves as a trauma surgeon at the John Muir Medical Center, which is certified as a level II trauma center by the American College of Surgeons and is Contra Costa County’s only trauma center. He sees patients in Walnut Creek and Brentwood.
Brian D. Hopkins M.D. is a private practice, board-certified urologist who has been practicing in the East Bay since 2000. In addition to being a diplomate of the American Board of Urology, he maintains a board certification in Female Pelvic Medicine and Reconstructive Surgery.
Dr. Hopkins has particular expertise and interest in the surgical treatment of genitourinary cancer (including prostate, bladder, and kidney cancers), advanced laparoscopic and robotic surgery, female pelvic prolapse and incontinence, and complex genitourinary reconstructive surgery. He has been performing robotic surgery with the da Vinci robot since 2002, shortly after it received FDA approval. He was one of the first users of the technology.
Dr. Hopkins’ mission is to offer the best urologic care to his patients, with an emphasis on ensuring that they receive first-rate surgical care, with the latest and most innovative surgical techniques available.
Dr. Hopkins was born and raised in San Diego, California. He received his undergraduate education at UCLA, where he earned a Bachelor of Science in kinesiology-physiology. He attended USC for medical school, graduating in 1994. He then completed an additional 6 years of training at USC, including one year of surgical internship, one year of general surgery residency, three years of urological residency, and a final year as chief resident of urology. He received extensive experience in urologic oncology and urinary tract reconstruction using intestinal segments in patients undergoing bladder removal due to bladder cancer.
In addition to his busy clinical schedule, Dr. Hopkins has been active with many leadership positions at the John Muir Medical Centers, including serving as chief of urology, chairman of surgery, and serving on the robotics steering committee as both a member and an advisor. He is also a member of the John Muir Cancer Committee and served as co-chairman of the Program in Urology from 2010 – 2016. Dr. Hopkins is a member of the American Urological Association, the American Urogynecologic Society, the American Association of Clinical Urologists, the Society of Laparoendoscopic Surgeons, Society of Robotic Urologic Surgery, the California Medical Association and the Alameda-Contra Costa Medical Association.
Dr. Hopkins enjoys spending time with his wife and two sons, playing golf, skiing, and spending time at the beach in San Diego.
Meet Dr. Hopkins and learn more about his approach to patient care:
Dr. Hopkins was featured on NBC Bay Area for treating patients with Benign Prostatic Hyperplasia (BPH) with a procedure called Urolift.
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!