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Biography: Friedrich August Haselwander (1859-1932) studied mathematics, physics, chemistry, botany, mineralogy, economics and electronics at the Technical University of Karlsruhe, the Universities of Strasbourg and Munich. In self-study he additionally acquired knowledge in the engineering sciences. In 1886, in Offenburg, where he was born, he constructed a DC dynamo machine from which he developed the three-phase generator, a world first. In 1891 he founded the Badische Elektrizitätswerke in Lahr, where he worked until their liquidation in 1893. In cooperation with Adolf Kolbe, he applied for his patents at home and abroad and knew how to draw financial benefit from them. After disputes over the copyright of his three-phase generator patent, Haselwander increasingly devoted himself to the development of motors. In 1897 he applied for a patent for the first compressorless crude oil engine. After working as a partner and technical director of the patent exploitation syndicate Haselwander, Wenk-Wolff and Genossen in Mannheim, as co-founder and partner of Maschinenfabrik Haselwander, among others.

Biography: Willy Hugo Hellpach (pseudonym Ernst Gystrow) was born on 26 February 1877 in Oels (Silesia) as son of the district court calculator Hugo Hellpach. After studying medicine, psychology and philosophy at the Universities of Greifswald and Leipzig, he received his doctorate (Dr. phil.) from Wilhelm Wundt at the University of Leipzig with his dissertation "Colour perception in indirect vision" and at the University of Heidelberg with his doctorate (Dr. med.) from Franz Nissel on the subject of "Analytical investigations on the psychology of hysteria". He received his psychiatric and neurological training at the Universities of Heidelberg and Berlin. Since 1911 he was professor for "Psychology on medical-scientific basis" at the Technical University Karlsruhe, after the end of World War I professor for "General and applied social and people psychology" in Heidelberg. His political career began in 1922 when he was appointed Minister of Culture and Education in Baden. From 1923 to 1925 he was President of the State of Baden, a member of the German Reich Council, and from 1928 to 1930 Member of the Reichstag of the German Democratic Party. In 1942 Hellpach was appointed Director of the Psychological Institute at the University of Heidelberg. Hellpach died on July 6, 1955 in Heidelberg. Holdings: The estate contains personal papers as well as documents from his professional and scientific activities. He was partly ordered by Willy Hellpach himself, partly by his pupils Wilhelm Witte and Monika Oels. In 1972 Wilhelm Witte sold the estate to the General State Archives, in 1975 Hellpach's cousin Hilda Otto supplemented the material mainly with correspondence from the publishing house, photos, medals and the like. Marie Salaba undertook the indexing in 1974, and when she indexed the later accesses in 1995, she maintained the first part'siederung.The following online finding aid was generated in 2006 as a shortened version from the aforementioned finding aids for the Kalliope portal, the central index of autographs in libraries, archives and museums. Categories that are not archive-specific, such as "life document", "letter" or "collection", are predefined by the portal.