Elizabeth Hadly is a professor of biology and of geological and environmental sciences at Stanford University. She first became interested in her field after exploring the Smithsonian Institution and wild lands in the west as a child. Following her undergraduate and graduate studies, she has conducted extensive research throughout North and South America on the ecology and evolution of vertebrates. She is especially interested in the biogeographic history of mammals around the world, most recently working in India and Costa Rica.

She now studies the evolution and ecology of vertebrates and the influence of the Holocene warming on the population biology of vertebrates, community assembly, and history of living organisms in North and South America.