Seung Hyun Kim is a professor emeritus of public administration at Seoul National University of Science and Technology, Seoul, South Korea, and a visiting scholar of political science at Purdue University. His research interests focus on social trust, methodology, and the third sector. His research has been published in many journals, including Administration & Society, International Journal of Public Opinion Research, International Public Management Journal, International Review of Public Administration, and Review of Public Personnel Administration. He wrote a book on the nonprofit sector and translated Albert O Hirschman’s The Passions and the Interests into Korean. Sangmook Kim is a professor of public administration at Seoul National University of Science and Technology, Seoul, South Korea. His research interests include public service motivation, organizational behavior, human resource management, and social trust. His research has been published in numerous journals, including Administration & Society, American Review of Public Administration, International Journal of Public Opinion Research, International Public Management Journal, International Review of Administrative Sciences, Journal of Public Administration Research and Theory, Public Administration Review, and Review of Public Personnel Administration. He is the author, co-author, and co-editor of numerous books including Public Administration and Policy in Korea (co-editor, Routledge, 2018).