Jerry N McDonaldJerry N. McDonald is a biogeographer who has specialized in the study of large mammals of the Quaternary, including human beings. Much of his work on bison was completed as a doctoral dissertation at the University of California, Los Angeles, in the 970s. Subsequent work, largely while a research associate in the National Museum of Natural History, has been done on muskoxen, deer, ground sloths, giant beavers, and the presence of early humans in eastern North America. Read More Read Less