as a consultancy company for several Swedish companies. The contact to Sweden was primarily arranged by the so-called Wallenberg group. In 1944 Topsoe produced the first small batch of sulfuric acid catalysts. Another company success came in 1948, when the development of the first nickel catalyst was finalized. That same year, Topsoe began cooperating with Vargöns AB in Vargön, Sweden with the aim of producing a catalyst for ammonia synthesis. Shortly after the war had come to an end, Topsoe became engaged in various activities in Mexico that were connected to Topsoe's financial contacts in the US, including the World Bank. This led to the company's involvement in the planning of Mexico's technical development as well as in the American agronomist Norman Borlaug's experiment with wheat in the Sonora region of Northern Mexico. In the years following 1950, Topsoe renewed its contacts with the research environment of the Soviet Union and maintained close contact for several years with both the scientific environment and organizations involved with engineering within the field of catalysis. In 1955, Topsoe established the French subsidiary Haldor Topsøe S.A. and opened an office in Paris. Throughout the years, Topsoe was involved in many industrial activities, some privately and some publicly governed, and built several industrial plants. One of the bigger projects in which Topsoe was involved, was the construction of a heavy water plant in Northern France. In 1958, Topsoe bought the estate Linderupgaard, situated outside Frederikssund, and the estate has been used for production of catalysts ever since. Topsoe opened a department in New York in 1961, called Haldor Topsoe Inc., and four years later the company bought a lot in Houston, Texas, that is now being used for one of Topsoe's production plants. In 1971, the office was moved from New York to Houston. Topsoe has delivered process design and technologies for several big ammonia plants around the world. In 1972, the ownership of Topsoe changed from being a privately owned company to being a public limited company, owned 50/50 by Haldor Topsøe and the Italian company Snamproggeti. In 1973, Topsoe headquarters moved to Søborg from Vedbæk, where it had been situated since 1964. Just a year later, in 1974, Topsoe moved the headquarters to its present location in Kongens Lyngby, just outside Copenhagen, Denmark. In the beginning of the 1980s, Topsoe opened two offices in Asia: Delhi and Beijing. In the beginning of the