School of Medicine
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Timothy C. Chang
Clinical Assistant Professor, Urology
BioDr. Timothy Chang is a Clinical Assistant Professor of Urology at Stanford University. He graduated with High Honors from Princeton University and received a Master of Science from Massachusetts Institute of Technology. He then obtained his medical degree and urology residency training from Stanford University School of Medicine. Dr. Chang has experience in a broad range of adult general urologic care, with a particular focus on kidney stone treatment for which he completed specialized fellowship training at Stanford. He received multiple research awards and authored or co-authored numerous academic publications. With his experience in both the engineering and medical fields, he has particular interest in developing technological medical advancements.
Bertha Chen, MD
Professor of Obstetrics and Gynecology (Gynecology - Urogynecology) and, by courtesy, of Urology
Current Research and Scholarly InterestsDr. Chen’s research examines the molecular causes of urinary incontinence and pelvic floor dysfunction. Recognizing that urinary incontinence linked to demise of smooth muscle sphincter function, she is investigating the potential use of stem cell regeneration to restore muscle capacity.
Tony Chen, MD
Clinical Assistant Professor, Urology
BioDr. Chen is a fellowship-trained urologist who specializes in male reproductive medicine. He is a clinical assistant professor in the Department of Urology at Stanford University School of Medicine.
Dr. Chen diagnoses and treats male infertility, erectile dysfunction, Peyronie’s Disease, Benign Prostatic Hyperplasia (BPH), hypogonadism, and other disorders of the male genitourinary tract. He emphasizes getting to know the whole patient and utilizing a stepwise approach to treatment when appropriate. When surgery is required, he excels at scrotal surgery, minimally invasive prostate de-obstruction, penile implant placement, microsurgical vasectomy reversal, varicocele treatment, and surgical sperm retrieval.
For every patient, Dr. Chen develops a personalized care plan emphasizing innovation, safety, and compassion.
Dr. Chen has published his research findings in journals including Urology Practice, the Journal of Sexual Medicine, Endocrine, the Journal of Pediatric Urology, Journal of Endourology, and elsewhere. Topics have included the association between mortality and male infertility, the association of the COVID-19 pandemic on male sexual function, national trends in vasectomy, and more. He co-wrote the chapter “Simulation and Ureteroscopy” for the textbook Ureteroscopy.
Dr. Chen is also an innovator with an interest in bringing novel technologies to the field of benign Urology. He has a background in the use of simulation science in medical teaching as well as in prototype design. He has received grant funding to prepare robotic surgeons for acute operating room scenarios and holds a provisional patent on a system for automated urine assessment and monitoring in the hospital.
He has made presentations on male infertility and surgical simulation at meetings of the American Urological Association, American College of Surgeons, and Sexual Medicine Society.
Dr. Chen has won recognition for his research and clinical achievements. He has received awards from the Western Section of the American Urological Association, American College of Surgeons, Society of Urologic Prosthetic Surgeons, and Sexual Medicine Society of North America.
He is a member of the American Urological Association, American College of Surgeons, International Society for Sexual Medicine, American Society for Reproductive Medicine, and Western Section of the American Urological Society.
Benjamin I. Chung
Associate Professor of Urology
Current Research and Scholarly InterestsRenal cell carcinoma and prostate cancer outcomes research and epidemiology.
Craig V. Comiter
Professor of Urology and, by courtesy, of Obstetrics and Gynecology
Current Research and Scholarly InterestsUsing various animal models of bladder outlet obstruction as a representation of human prostatic disease, I am investigating how intervening with pharmacotherapy, neuromodulation, and other novel therapies may help to reverse the adverse changes in the bladder due to the obstruction.
I also am investigating new, minimally invasive treatments for post-prostatectomy urinary incontinence.
I am also investigating the role of neruomodulation in the treatment of chronic pelvic pain and IC.
Christos E. Constantinou
Associate Professor of Urology, Emeritus
Current Research and Scholarly InterestsMy main recent interest is the application of Biomedical Engineering approaches for the clinical visualization and characterization of the static and dynamic properties of pelvic floor function. This extends to ultrasound Imaging and image processing, construction of computer models and biomechanics analysis of pelvic floor function. It is envisioned that these considerations are important constituents of the clinical evaluation of patients with lower urinary tract dysfunction and urodynamics.