Keith has been a doctoral student in the Department of Philosophy since 2023. His primary academic interests are moral psychology, metaethics, political and legal philosophy, as well as applied ethics.

Currently, he is exploring the implications of moral psychology on metaethics and political and legal philosophy. Within political and legal philosophy, he is engaged in issues about authority, obligation, policing and protesting. In applied ethics, he focuses mainly on AI ethics, animal ethics, and other ethical problems of life and death, aging, mental health, and sexuality.

For the representation of his Cantonese identity, as hindered by the spelling in his legal name, Keith kindly requests to be addressed as ‘Lui’ instead of ‘Lei’ in academic contexts.