Paul F. Clark, professor emeritus of Medical Microbiology, began his career at the University in 1914, retiring thirty-eight years later in 1952. He was the first chairman of the University of Wisconsin-Madison Department of Medical Bacteriology. Pioneer Microbiologists of America was published by the University of Wisconsin Press in 1961. Clark’s work was an attempt to chronicle and interpret early American microbiology beginning in the nineteenth century and ending around 1916. As a history of American microbiology, this work is even richer because Clark knew many of the people about whom he wrote, including Fred, Baldwin, and McCoy.