Photograph of William Hallock Park, MD (1863-1939), working at his desk. Dr. Park taught at Bellevue Hospital Medical College as Adjunct Professor of Bacteriology and Hygiene from 1897 to 1898. He taught at University and Bellevue Hospital Medical College as Adjunct Professor of Bacteriology and Hygiene (1898-1899), Associate Professor of Bacteriology and Hygiene (1899-1900), and Professor of Bacteriology and Hygiene (1900-).