He created the Cologne International Colloquium on Economic and Social History: Kölner Kolloquien zur Internationalen Wirtschafts- und Sozialgeschichte , which aimed to unite and associate historians and researchers studying European economic and social history in post-war Europe during the 1960s and early 1970s. The first colloquium focused on the economic relations between Europe and the Iberian Peninsula during the Age of Discovery and the impact of the new international markets established and linked by maritime trade. The ones that followed focused on the importance of copper and iron in Renaissance Europe. The minutes of the conferences were published under the following titles: Foreign Merchants in the Iberian Peninsula during the 15th and 16th centuries, Fremde Kaufleute auf der Iberischen Halbinsel , Areas and main points of iron extraction and production in Europe (1500-1650), Schwerpunkte der Eisengewinnung und Eisenproduktion in Europa (1500-1650), and Areas and main points of copper production and copper trade in Europe, Schwerpunkte der Kupferproduktion und des Kupferhandels in Europa (1500-1650) and the so-called "Kölner Vorträge" (Cologne Exhibitions and Lectures), which are still held today. At this time, he was appointed scientific director of the Fugger family archive, a role that allowed him to deepen his studies and research into Portuguese and Spanish documentation. In 1990 he published in three volumes a work that was probably his magnum opus : Die Fugger in Spanien und Portugal bis 1560 [The Fuggers in Spain and Portugal until 1560]. After his retirement, he continued to take part in international colloquia and congresses, as well as the 2nd International Colloquium on the History of Madeira (1989), with a paper on " Relações comerciais da Madeira e dos Açores com a Alemanha e Escandinávia " [Trade relations of Madeira and the Azores with Germany and Scandinavia].

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