Daniel TL Shek, PhD, FHKPS, BBS, SBS, JP, is Associate Vice President (undergraduate Programme) and Chair Professor of Applied Social Sciences, The Hong Kong Polytechnic University, Hunghom, Hong Kong, PRC, Advisory Professor of East China Normal University, Honorary Professor of Kiang Wu Nursing College of Macau and Adjunct Professor, Division of Adolescent Medicine, Department of Pediatrics, University of Kentucky College of Medicine, Lexington, United States. He is Chief Editor of Journal of Youth Studies and Applied Research in Quality of Life, past Consulting Editor of Journal of Clinical Psychology, and editorial board member of Social Indicators Research, International Journal of Adolescent Medicine and Health, Asian Journal of Counseling, International Journal on Disability and Human Development, International Journal of Adolescent Medicine and Health and Journal of Adolescent Health. He has served in many government advisory bodies, including the Action Committee against Narcotics, Commission on Youth, Fight Crime Committee and Family Council. He has published numerous books, book chapters and more than 500 scientific articles in international refereed journals. Joav Merrick, MD, MMedSci, DMSc, born and educated in Denmark is professor of pediatrics, child health and human development, Division of Pediatrics, Hadassah Hebrew University Medical Center, Mt Scopus Campus, Jerusalem, Israel and Kentucky Children's Hospital, University of Kentucky, Lexington, Kentucky United States and professor of public health at the Center for Healthy Development, School of Public Health, Georgia State University, Atlanta, United States, the medical director of the Health Services, Division for Intellectual and Developmental Disabilities, Ministry of Social Affairs and Social Services, Jerusalem, the founder and director of the National Institute of Child Health and Human Development in Israel.