Dr. Dionysiou teaches courses in the areas of Organizational Behavior and Organizational Change. 

His research interests focus on processes of organizing and sensemaking, organizational routines and capabilities, employee voice, and organizational trust. His research has been presented at international academic conferences, among which, the Academy of Management (AoM) and the Group for Organization Studies (EGOS) and published in international outlets like the Academy of Management Review, Journal of Business Ethics, and the Cambridge Handbook of Routine Dynamics. 

Dr. Dionysiou has significant professional experience in defense logistics and he was representative of the Hellenic Army in several NATO cooperative logistics partnerships. During his Ph.D. research, he studied the organizing practices of start-up telecommunication companies in Greece.