1. Research Animal Scientist, USDA, ARS, Grazinglands Research Laboratory, El Reno, OK, USA
2. Agronomist, Clinical Associate Professor and Director of WVU Farms, West Virginia University, Morgantown, WV, USA
3. Research Plant Physiologist (Retired), USDA, ARS, Plant Science Research Unit, Raleigh, NC, USA
4. Research Soil Microbiologist, USDA, ARS, Grazinglands Research Laboratory, El Reno, OK, USA