Christoph is a Professor of Public Law and Jurisprudence at the Humboldt-Universität zu Berlin and Permanent Fellow at the Wissenschaftskolleg zu Berlin. In his research, he is concerned with German, European, and comparative constitutional law, democratic practices, and theories of social norms. He represented the German Parliament, Federal Council, and Government at the German Federal Constitutional Court. In 2016, Christoph received the Leibniz Prize awarded by the German Research Foundation.
At THE NEW INSTITUTE Christoph was the director of the program "The Future of Democracy".