Sean R. Williamson, MD is the Director of Genitourinary Pathology at the Cleveland Clinic. Originally from Pittsburgh, Pennsylvania, he studied medicine at Temple University School of Medicine in Philadelphia, Pennsylvania, followed by Anatomic and Clinical Pathology residency training at the Indiana University School of Medicine. At Indiana University, he also served as chief resident and fellow in genitourinary pathology. Prior to joining the Cleveland Clinic, he spent several years in the Henry Ford Health System in the Detroit Metro area. He has contributed to more than 100 peer-reviewed journal articles and is co-author of a textbook Atlas of Genitourinary Pathology: A Pattern Based Approach, currently in press. He is a lead author for several topics in the upcoming 5th edition of the World Health Organization Classification of tumors of the urinary system, including the urinary bladder and kidney. He currently serves on the editorial boards of several journals, including Modern Pathology and Histopathology and is a section editor for the journal Diagnostic Pathology. He was selected by the Henry Ford Health System pathology residents as the Anatomic Pathology Teacher of the Year 4 times. Dr. Williamson's research is focused on diagnostic, prognostic, and staging challenges in surgical pathology, with emphasis on recognizing novel tumor histologic features that correlate with underlying molecular events and significance for patient outcome.