Dr. Daniel G. Strawn is a Professor of Soil Chemistry in the Plant, Soil, and Entomological Sciences Department at the University of Idaho in Moscow.

Dr. Hinrich L. Bohn is a Professor Emeritus in the Department of Soil, Water, and Environmental Science at the University of Arizona, Tucson.

Dr. George A. O’Connor is a Professor in the Soil and Water Science Department at the University of Florida in Gainesville.