He is interested in identifying and developing good practices for promoting wellbeing in the community. His monograph is on ‘Understanding Poverty in Hong Kong’, which has won the 11th Hong Kong Book Prize held. He is serving as the Chair of the Research Committee of the Family Planning Association of Hong Kong (2012-present), and was the interim chair of the ESEAOR of the International Planned Parenthood Federation (2017-2018), the Secretary General of Asian Population Association (2014-2017), the chairman of the committee of preventing students’ suicide (2016), a member of the Steering Committee on Population Policy (2012-2013), a vice-president of the International Association of Suicide Prevention (2009-2013), and an associate member of the Central Policy Unit of the Hong Kong SAR Government (2014-2016). He has received various awards and recognitions, including the Rehabilitation International Centennial Award for significant contribution in 2023; Hong Kong Spirit Award by the South China Morning Post and Sino Group in 2021, the Humanities and Social Sciences Prestigious Fellowship in 2020, Australia-China Alumni Award (Research) in 2019, a Medal of Honor from the Hong Kong SAR Government in 2017, the Stengel Research award in 2012, an outstanding supervisor and researcher of the University of Hong Kong in 2009, 2011 and 2017 respectively, and a distinguished alumni of La Trobe University in 2008. He has published more than 500 research papers relating to population health and suicide prevention. His Chinese books include “Understanding Poverty in Hong Kong (Third Edition)”, “Be with You: Learning from Suicide Notes”, and “Understanding Poverty in Hong Kong (Revised Edition)”.