I am the Founders Professor and Emeritus Chief of Urology and Director of the Urology Residency Program at Penn Medicine. I received my medical degree in 1966, and have an honorary PhD from the University of Patras, Greece and am also an Honorary Professor at the Institute of Urology, Russian Ministry of Health.

My clinical and research interests include lower urinary tract, urinary incontinence and lower urinary tract dysfunction, prostate enlargement, and evaluation/management of prostate, bladder and kidney cancer. I have many years of experience in these areas and was honored to receive the International Continence Society (ICS) Lifetime Achievement Award in 2020. I have authored and co-authored over 1,000 papers and book chapters during my years of practice.

Ferdinand C. Valentine Award in Urology, 2011

Recipient of the Edward L. Keyes Medal, 2012

Recognized by America's Top Doctors, 2007, 2008, 2010, 2012 - 2018

Recognized by Best Doctors in America 2003 - 2018

Recognized in Philadelphia magazine's annual Top Docs issues, 2002, 2004 - 2010, 2017, and 2018 - 2021