Diane Bricker, Ph.D., is the former director of the Early Intervention Program at the University of Oregon and a highly respected, well-known authority in the field of early intervention. She has directed a number of national demonstration projects and research efforts focused on examining the efficacy of early intervention; the development of AEPS; and the study of the Ages & Stages Questionnaires, a comprehensive, parent-completed screening tool. She has focused her professional career on the development and study of assessment systems and intervention approaches for young children with disabilities and those at risk for developing disabilities. Dr. Bricker has been instrumental in the development of graduate-level personnel preparation programs that have produced professionals who are delivering quality services to thousands of young children and their families. She has published extensively in the field of early intervention.

Betty Capt, Ph.D., OTR, is Research Associate in the Early Intervention Program at the University of Oregon. She teaches graduate-level coursework in early intervention and provides professional development seminars and workshops nationwide on best practices in assessment and intervention. She also is an occupational therapist and has provided services in early intervention for more than 20 years.

JoAnn (JJ) Johnson, Ph.D., is Director of the Research and Educational Planning Center and Nevada University Center for Excellence in Developmental Disabilities at the University of Nevada–Reno. She also has an adjunct faculty appointment in Curriculum and Instruction and teaches courses in early intervention and program evaluation. Her professional experience includes hospital-, home-, and center-based early intervention and developmental services; developmental assessment and evaluation; supervision and program coordination; and university and outreach training and instruction. Since 1998, Dr. Johnson has provided workshops and training throughout the United States on the use of the AEPS for families and professionals working in applied settings.

Kristie Pretti-Frontczak, Ph.D., is Associate Professor, Department of Educational Foundations and Special Services at Kent State University. She received her doctorate in early intervention from the University of Oregon and has extensive experience in preparing preservice and in-service personnel to use an activity-based approach to working with young children and their families. Dr. Pretti-Frontczak also directs the Early Childhood Intervention Specialist Program at Kent State University where she is responsible for preparing preservice teachers to work with children from birth to age 8. She frequently provides training and technical assistance to programs across the United States interested in AEPS and activity-based intervention (ABI). Her line of research also centers on the treatment validity of AEPS and efficacy of ABI.

Kristine Slentz, Ph.D., chairs the Department of Special Education at Western Washington University and teaches graduate and undergraduate classes in early childhood special education and special education. Her particular areas of interest and expertise are assessment and evaluation, early intervention, risk and resiliency, and working with families across cultures.

Elizabeth Straka, Ph.D., CCC-SLP, provides training and technical assistance to agencies that provide services to young children with disabilities and their families. She provides training seminars nationally in regard to recommended practice in assessment and intervention with young children and their families, with an emphasis on team collaboration. Dr. Straka continues to practice as a therapist, focusing on the assessment and treatment of developmental disorders in young children.

Misti Waddell, M.S., is a Senior Research Assistant/Project Coordinator at the Early Intervention Program at the University of Oregon. She also has contributed to the development, research, and training of AEPS since the early 1990s. She has used the AEPS in classroom settings and has coordinated several federally funded, field-initiated research projects and outreach training projects. Ms. Waddell is Project Coordinator for the outreach training project titled "Creating and Sustaining Change Across Diverse Early Intervention Systems (CASCADES)."