[3] In 1965, after working as an adult educator and by order of the Chamber of Agriculture in Hannover, he entered service at University of Hohenheim as research associate.
Passing his state doctorship in 1968, he conducted a guest professorship at University of New England (Australia) in Armidale, New South Wales.
At University of Hohenheim, he was one of a few professors speaking on behalf of marxist students prone to regulations of the Radikalenerlass laws, that maintained to target various forms of extremism, but was mainly anti-communist in nature.
Bergmann authored, edited and translated more than 50 books pertaining to agronomics and the history of international proletarian movements.
An extensive bibliography can be found in the brochure: Die Tradition kritischer Solidarität von Luxemburg bis Gorbatschow, Pankower Vorträge, Heft 200, hrsg.