Valerius Geist: a global leader in deer biology and conservation.

Professor Valerius Geist was a world-renowned deer biologist who made important contributions to deer science, especially in the areas of animal behaviour, the evolution of cervids in the Pleistocene, and deer conservation. One of his greatest accomplishments was to define the core principles that have made wildlife management unique in North America. The deer science community deeply regrets his passing in 2021. Eulogy for the life and achievements of Professor Valerius Geist. [ABSTRACT FROM AUTHOR]