); and the University of London (PhD), his major areas of expertise are legal philosophy, and human rights, in particular the protection of privacy on which he is a leading international authority.
His books have been translated into numerous languages including Arabic, Greek, Chinese, Indonesian, Italian, Portuguese, Turkish, Japanese, Thai, Korean, Slovene, and Georgian.
The sixth edition of his Understanding Jurisprudence: An Introduction to Legal Theory was published by Oxford University Press in 2021.
A collection of his writings, Law, Morality, and the Private Domain was published by Hong Kong University Press in 2000.
He was for several years editor of the Hong Kong Law Journal, and presented the RTHK television and radio programme, The Week in Politics.