Wiegmann specialized in the study of herpetology and mammalogy. As of 2017, Lee teaches mammalogy and urban ecology at Southern Illinois University. The mammalogy collection has roughly 30,618 cataloged specimens and approximately 1,000 non-cataloged specimens. Kovacs has been the President of the Society for Marine Mammalogy. The mammalogy collection contains about 36,000 specimens and 180 holotypes. Henderson wrote books entitled "The Practical Uses of Birds" and "Economic Mammalogy". In 1919, he became the Assistant Curator in the Museum's Department of Mammalogy. A somewhat standardized classification system has been adopted by most current mammalogy classroom textbooks. The most well known of these is the "Journal of Mammalogy". Since 1992, the mammalogy collection at Dickinson Hall has undergone rapid growth and expansion.