Professor Manfred Weiss started as a research fellow at the Center for the Study of Law and Society of the California University in Berkeley from 1965 to 1966. From 1970 to 1972 he was assistant professor and from 1972 to 1974 associate professor at the Law School of the J.W. Goethe University in Frankfurt. Since 1974 he has been full professor for labour law and civil law, first (from 1974 to 1977) at the Law School of the University in Hamburg and then (since 1977) at the Law School of the J.W. Goethe University in Frankfurt.
Longer-term guest professorships brought him to universities in France, Belgium, the United States and still South Africa.
He is also a consultant to different governments abroad (especially South Africa and Eastern Europe), consultant to the International Labour Organization and Consultant to the EU Commission since 1986.
Professor Weiss is the co-editor of the International Labour Law Reports and of several journals. He is author, co-author and editor of books and articles in the fields of labour law, industrial relations, civil law and sociology of law.
He received honorary doctorates from universities in France, Peru, Hungary and South Africa. In 2015 He got the award for outstanding contribution to labour law.