1965 awarded degree of Dr. iur. from the University of Zurich with a dissertation on the Swedish Ombudsman
Clerkship at a District Court
1967 admission to the Bar, Canton of Zurich
1967/68 law clerk at the Superior Court (Obergericht) of the Canton of Zurich
1969 visiting research scholar at the University of Michigan Law School; based on this research, publication of a book on the U.S. Supreme Court and Politics (1972)
1970 – 1972 research assistant, University of Zurich; recognition as a university lecturer (Habilitation) in constitutional and administrative law
Autumn 1972 – autumn 1975 Secretary General of the Council of the Federal Institutes of Technology
Autumn 1975 – summer 2004 professor of constitutional law, administrative law and comparative constitutional law, University of Zurich; from 1990 until 2004 Director of the Institute of Public International Law and Comparative Constitutional Law. Dean of the Law Faculty 1990 – 1992.
Research during sabbaticals at the University of Michigan Law School and at the universities of Aix/Marseille, Pisa and East Anglia.
Co-author of books on Swiss and comparative constitution law which are widely used in teaching at universities as well as in legal practice.
In his numerous publications Haller has emphasised the need to compare constitutional orders and to analyse constitutional issues (such as fundamental rights, systems of government and constitutional adjudication) in a comparative context. Many articles focus on the ombudsman institution.
2004 – 2010: following retirement teaching engagements in constitutional law and comparative constitutional law at the universities of Lucerne (2005), St. Gallen (2004 – 2008), Zurich (2009 and 2010) and at the Duke Geneva Institute in Transnational Law (summer course 2011). Further publications, among others a book on “The Swiss Constitution in a Comparative Context” (2009).
1976 – 1989 Associate Judge of the Administrative Court of the Canton of Zurich
1979 – 1987 member of the board of Zurich’s Law Association; chairman 1983 – 1985
1995 – 2002 member of the Foundation Council of the Swiss National Science Foundation
Member of the Research Committee of the International Ombudsman Institute (until 1988), special award of the International Ombudsman Institute (conferment at the Fourth International Ombudsman Conference in Canberra, 1988)
Since 2004 honorary member of the Association of Swiss Parliamentary Ombudsmen