Meet Our Authors

Leading Experts in Psychological Assessment

Dr. Gale Roid


Dr. Gale Roid is Professor of Education at SMU specializing in assessment and test development in the School of Education & Human Development. He was formerly Dunn Professor of Educational and Psychological Assessment, Department of Special Education, Vanderbilt University, Nashville, Tennessee. He is author of several well-known Stoelting tests including the Leiter-R and Merrill-Palmer-Revised.

Dr. Susan Mayes


Susan Mayes, PhD, is Chief Psychologist and Professor in the Department of Psychiatry at Penn State College of Medicine. Dr. Mayes earned her BA from Mount Holyoke College and PhD from the University of Pennsylvania.

Dr. Mayes is a certified school psychologist, licensed psychologist, and former elementary and special education teacher. She has 39 years experience with children who have autism, ADHD, learning disabilities, and other neurodevelopmental disorders. Dr. Mayes has evaluated over 3,000 children in her diagnostic clinic, and has earned awards for scoring at the 99th percentile in patient satisfaction. She has published over 75 articles on the diagnosis, treatment, and psychological functioning of children with autism, ADHD, and other neurodevelopmental disorders and has published diagnostic instruments, including the Checklist for Autism Spectrum Disorder and the Mayes Hyperactivity Observation System.