Peter R. Grant is the Class of 1877 Professor of Zoology at Princeton University. His books include "Ecology and Evolution of Darwin's Finches" (Princeton). B. Rosemary Grant is a senior research scholar in the Department of Ecology and Evolutionary Biology at Princeton University. She is the coauthor, with Peter R. Grant, of "Evolutionary Dynamics of a Natural Population: The Large Cactus Finch of the Galapagos."