Thomas Achenbach is Professor of Psychiatry and Director of the Center for Children, Youth and Families at the University of Vermont in the US.

Jim Alexander is Professor of Psychology at the University of Utah, Salt Lake City. His work focuses on family dynamics and treating dysfunctional relationships in order to reduce behavior problems in young people.

Steve Aos is Assistant Director of the Washington State Institute for Public Policy, established by the Washington State Government to provide evidence relevant to major policy decisions.

Jeffrey Jensen Arnett is a Research Professor in the Department of Psychology at Clark University, Worcester, Massachusetts and editor of the Journal of Adolescent Research.

Nick Axford is a researcher at the Dartington Social Research Unit in England.