Ruifeng (Ray) Guo, M.D., Ph.D., is a diagnostic pathologist specializing in dermatopathology, general surgical pathology and ophthalmic pathology. His clinical and research interests are in the areas of disease diagnosis, exploration of markers and clues to predict disease severity, and therapeutic guidance. Dr. Guo specializes in skin diseases and conjunctival diseases, including tumors and inflammatory conditions. He is also heavily involved in Mayo Clinic’s intraoperative frozen section service for patients undergoing surgical treatment, and works with highly diverse types of diseases in surgical pathology.