I work in the area of political sociology, political psychology, and law & society; and specialise on transitional (historical) justice, collective memory, and democratization. My book Communists and Their Victims (UPenn, 2018) examines the impact of justice on victims, perpetrators and society; and results in the transformative theory of justice. My book Lustration and Transitional Justice (UPenn, 2011) conceptualizes exclusive, inclusive and reconciliatory systems and examines their effect on trust and reconciliation. It received the Concept Analysis Award by the International Political Science Association in 2012. I have completed a co-authored monograph (with Ian Holliday) entitled Liberalism and Democracy in Myanmar (OUP, 2018) and proposed the concept of limited liberalism to explain puzzles of political culture in democratizing countries. I am a professor in Lingnan University, Hong Kong. I also held positions at Yale, Newcastle, CityU, BaptistU, Wits, Oxford and Harvard.