Faculty: David Friedlander, MD and Karen Stern, MD

Moderator: Ojas Shah, MD

Dr. Karen Stern

Karen Stern M.D. is an Assistant Professor in the Department of Urology at Mayo Clinic Arizona in Phoenix, Arizona. She specializes in the medical and surgical management of complex stone disease as well as the minimally invasive management of BPH. At Mayo Clinic she manages the multi-disciplinary stone clinic for recurrent stone formers which includes urology, nephrology and a dietician who specializes in stone prevention. Her surgical practice includes complex ureteroscopy, mini-percutaneous nephrolithotomy, and ultrasound-guided percutaneous access for PCNL. She is involved in multiple ongoing clinical trials and is part of the Endourology Disease Group for Excellence (EDGE) and Collaborative for Research in Endourology (CoRE) research consortiums. She received her M.D. from the University of Arizona, where she received the Alpha Omega Alpha distinction. She completed Urology residency at Mayo Clinic Arizona and was a Mayo Clinic Scholar during her Endourology fellowship at the Glickman Urological & Kidney Institute at Cleveland Clinic where she was awarded the Urology Fellow Teacher of the Year in 2019. She is the Assistant Program Director for the Endourology Fellowship at Mayo Clinic Arizona and takes an active role in medical student, resident, and fellow education.

Dr. David Friedlander

David F. Friedlander, MD, MPH is an Assistant Professor of urology at the University of North Carolina School of Medicine. After graduating from Bowdoin College, he spent a year working in the California state capitol as a research fellow in the office of the vice-chair of the health committee. Dr. Friedlander received his medical degree from Vanderbilt University in Nashville, TN during which time he also completed an MPH at the Harvard TH Chan School of Public Health. He subsequently completed his residency at Brigham and Women’s Hospital in Boston, MA where he stayed on for an NIH-funded research fellowship. He subsequently completed a clinical fellowship in endourology and minimally invasive surgery at the University of California-San Diego. His research interests include understanding how health care policy effects surgical outcomes and costs, as well as understanding both clinical and social factors that influence the quality of health care delivery.

Dr. Ojas Shah

Dr. Ojas Shah is the George F. Cahill Professor of Urology at Columbia University Vagelos College of Physicians and Surgeons. He serves as the Director of the Division of Endourology and Stone Disease and is the Director of the Fellowship in Endourology. His clinical and research interests include surgical and metabolic treatments of kidney stone disease, minimally invasive urologic surgery, upper urinary tract urothelial carcinoma (transitional cell carcinoma), ureteral strictures, ureteropelvic junction (UPJ) obstruction, ureteral/renal reconstructive surgery, and BPH (benign prostate hyperplasia). He serves as the principal investigator in many clinical research trials regarding the surgical or medical management of stone disease. 


He is a graduate of the Honors Program in Medical Education at Northwestern University School of Medicine. He completed his urologic training at New York University Medical Center. He spent an additional year at Wake Forest University Health Sciences Center as a fellow in endourology, laparoscopy and metabolic stone disease.


Dr. Shah is a nationally and internationally recognized expert in the medical and surgical management of patients with urinary stone disease. He is co-editor of the 5th Edition of Taneja’s Complications of Urologic Surgery textbook. He recently completed his 4-year term on the American Board of Urology’s Examination Committee. He was a member of the American Urological Association’s Surgical Management of Stones Guidelines Committee, and previously served as an Assistant Editor for the Journal of Urology. He is the current Team Leader for the American Urological Association New Technologies and Imaging Committee.