From 1965 to 1971, Riegler was a teacher at agricultural colleges, and from 1971 to 1972 he was the director of the agricultural colleges in
Stainz. He was Director of the Styrian Farmers' Association from 1972 to 1980 and then Director of the Austrian Farmers' Association from 1980 to 1983. Riegler served as
Vice-Chancellor of Austria and
Chair of the People's Party from 1989 to 1991. He also served as Federal Minister for Agriculture and Forestry from 1987 to 1990 and Federal Minister for Federalism and Administrative Reform from 1989 to 1991. == Personal life ==