As a positivist, Walter tried to apply the methods of natural science to sociological and psychological issues.
Walter also wrote for scientific (Vierteljahrsschrift der Naturforschenden Gesellschaft in Zürich and Synthese) as well as social democratic periodicals (Rote Revue).
In 1951 he became visiting lecturer at the Universität St. Gallen and from 1957 until 1968 he was extraordinary professor for sociology at the same institute.
In addition to his internationally adopted Monography Walter wrote for many years for a variety of newspapers and magazines.
[2] Among other things Walter focused on scientific topics with political relevance such as global warming.