Erin B. Rasmussen is Professor of Psychology at Idaho State University, USA.

Casey J. Clay is Director of Behavior Programs at the Thompson Autism Center at Children's Hospital Orange County in California, USA.

W. David Pierce (1945-2020) was a Professor Emeritus of Sociology at the University of Alberta, Canada.

Carl D. Cheney is Professor, Emeritus, of Psychology at Utah State University, USA.