Dr. Zarka earned his MD from St. Louis University School of Medicine and is currently a cytopathologist and professor at the Mayo Clinic in Arizona. He is the author of Practical Cytopathology: A Diagnostic Approach.

Dr. Zhou is an author of numerous texts within the field of pathology, including Uropathology. He is currently a pathology professor and Director of Surgical Pathology the NYU Tisch Hospital.