Tadeusz Marian Ostrowski is associate professor at the Jagiellonian University in Kraków, Poland, where he is head of the Developmental and Health Psychology Department of the Institute of Applied Psychology.

Bogusława Piasecka is assistant professor in the Developmental and Health Psychology Department of the Institute of Applied Psychology, Jagiellonian University in Kraków, Poland. She is a certified psychotherapist of the Polish Psychological Association and leads couples and family psychotherapy at the Kraków Therapy Centre and trainings in systemic family therapy at the Center for Psychotherapy and Systemic Training.

Krzysztof Gerc is assistant professor in the Developmental and Health Psychology Department of the Institute of Applied Psychology, Jagiellonian University in Kraków, Poland. His research interests include mental development of disabled people and the issues of supporting the development of children and young people who show developmental deficits.