Jacek L. Mostwin, M.D., D. Phil., is a professor of urology and director of the division of neurological and reconstructive urology at the James Buchanan Brady Urological Institute at Johns Hopkins Medicine in Baltimore. A urological surgeon at Johns Hopkins, he focuses on prostate cancer and has performed more than 3,000 radical prostatectomies. Among his major research interests are urinary continence and bladder function. Most of his scientific publications have dealt with lower urinary tract problems.