Sidney W. Bijou, PhD, is widely regarded a one of the fathers of applied behavior psychology. He was Distinguished Professor of Psychology at the University of Nevada, Reno, until his retirement in 2000, the final position in a distinguished career that included a ten-year post-doctoral fellowship with B.F. Skinner at Harvard University.
Emilio Ribes, PhD, is professor at and director of the Center for Studies and Research on Behavior at the University of Guadalajara, Mexico.