His research has centered mainly on social dilemma, social capital, social connectedness and interactions, community psychology and well-being, and civic participation and educational practices. He is currently working on a couple of projects directed at pathways to subjective well-being across the life cycle in Japan and Korea, roles of neighborhood perception and social activity participation on the linkage between depression and suicidal ideation, and family context and its consequences on psychological well-being and educational outcomes of multicultural children in Korea.