Seidman is known for his contributions to constitutional legal theory, principally his theory of unsettlement put forward in his book Our Unsettled Constitution: A New Defense of Constitutionalism and Judicial Review (Yale 2001) [REF].
Seidman's defense of judicial review provided a counterpoint within the critical legal studies school to his colleague and sometime collaborator Mark Tushnet's attack on judicial review as undemocratic.