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Research focuses on (1) the philosophy of law, with particular concentration on forms of legal reasoning, the nature of rules, the interpretation of rules, and the relationship between rules and theories of the nature of law; (2) constitutional law and constitutionalism, with a special interest in issues of constitutional interpretation and freedom of speech and press; (3) legal interpretation, with particular focus on the nature of legal language and on issues of vagueness and open texture. Present research centers also on comparative, international, and legal development dimensions of the above, looking at both the causes and consequences of different forms of constitutional design, and of different approaches to the entrenchment and enforcement of constitutional rights.