M Brett Callaway Author & Editor

M. Brett Callaway is tropical germplasm manager at Pioneer Hi-Bred International. He has written a number of publications on plant breeding and horticulture and has done research in Central America. Charles A. Francis is director of the Center for Sustainable Agricultural Systems, a professor of agronomy, and an extension crops specialist at the University of Nebraska-Lincoln. His other books include Enough Food, Multiple Cropping Systems, and Sustainable Agriculture for Temperate Zones.