He subsequently worked for the chemical industry, among other positions for the firm Phoenix-Gummiwerke and for Unilever in research, development, and production. Since his retirement in 1984 he has worked for various businesses as a consultant on issues of environmental protection and toxicology. As a member of the history of chemistry interest group of the German Chemical Society he has published several articles on the history of twentieth-century chemistry. His biography of Fritz Haber, published in German in 1994, was made a “science book of the year” by the magazine Bild der Wissenschaft and in 1997, Stoltzenberg received the Prize of the German Chemical Society for Writers.
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