Professor Daniel TL Shek is Chair Professor of Applied Social Sciences, The Hong Kong Polytechnic University, Hong Kong, PRC, Advisory Professor of East China Normal University, Shanghai, PRC, and Honorary Professor of Kiang Wu Nursing College of Macau, Macau, PRC. He is Chief Editor of Journal of Youth Studies, Editorial Advisor of British Journal of Social Work, and editorial board members of several international refereed journals, such as Social Indicators Research. He has served in many high level government advisory bodies. He has published numerous books and more than 450 scientific articles in international refereed journals. Dr. Rachel Sun, PhD is Assistant Professor, Faculty of Education, The University of Hong Kong. She is the Principal Investigator of school misbehavior research studies and a Co-Principal Investigator of a positive youth development program and a university’s leadership program in Hong Kong. Her work appears in Educational Psychology, British Journal of Guidance and Counselling, Journal of Adolescence, Journal of Youth and Adolescence, Adolescence, Pastoral Psychology, Social Indicators Research and The Scientific World Journal. She is a member of the Executive Committee of the Society of Boys’ Centres and a member of the editorial board of Research on Social Work Practice.