1. Research associate, Colorado State University, Fort Collins 80523.
2. Senior research scientist, Colorado State University, Fort Collins 80523.
3. International Livestock Center for Africa, Post Office Box 5689, Addis Ababa, Ethiopia
4. Postdoctoral research associate at NREL.
5. Assistant professor in the Department of Anthropology, University of Georgia, Athens 30602.
6. Research associate at NREL.