author
A mid-20th-century American mammalogist and conservationist, he is best known for field-based research on mammals in the western United States and Alaska. His published work helped document species ranges and practical wildlife-management questions with a careful, scientific eye.

by Stephen David Durrant, Richard M. Hansen, M. Raymond Lee
Richard M. Hansen, also known as Richard Maas Hansen, is identified in reliable reference sources as an American zoologist, mammalogist, and conservationist. His work is linked especially with mammal research and specimen-based field studies, and he is credited as an author on scientific publications from the 1950s.
His name appears on research including Additional Records and Extensions of Known Ranges of Mammals from Utah, produced with Stephen D. Durrant and M. Raymond Lee, which expanded knowledge of where several mammal species were known to occur. He also contributed to government research on wildlife management topics, including studies related to reindeer range and pocket gopher control.
Because readily available biographical sources are sparse, many personal details are hard to confirm. Even so, the published record shows a scientist whose career was rooted in observation, collection, and practical zoology, and whose work contributed to a better understanding of North American mammals.