Fabricius was trained as a cabinetmaker by Niels Vodder before attending the School for Interior Design where he studied under Finn Juhl. It was there that he met the blacksmith Jørgen Kastholm. They had a common approach to furniture design, never wanting to compromise on aesthetics. In 1961, the pair set up a design studio and in 1965 they exhibited at the furniture fair in Fredericia where the German furniture manufacturer Alfred Kill noticed their work. Their international breakthrough came at the Cologne Fair in 1966 when they exhibited a whole series of office and home furniture leading to orders from ten large furniture concerns. Their minimalistic designs, both attractive and comfortable, were usually in steel and leather. The Tulip Chair, the Grasshopper Chair and the Scimitar Chair are among their most successful works.