Oskars Kaulēns is a school director, a history teacher, and a PhD candidate of the academic doctoral study programme of “Education sciences” within the Faculty of Education, Psychology and Art of the University of Latvia (planned defence in 2023). As a researcher, he participates in the study, "Model and tool for supporting the implementation of the school as a learning organisation approach in educational institutions", and working on his doctoral thesis within the framework of this project, he studies how to effectively organise the professional development of teachers in school so that it corresponds to the theoretical model of SLO and develops the teachers’ professional development standard for the implementation of the school as a learning organization. The data obtained in his research have appeared in several scientific publications and have been presented in papers at conferences devoted to educational issues.