He is best known for his work in the Wiener Werkstätte movement, which he co-founded with Koloman Moser in 1903. The Wiener Werkstätte was a community of artists and craftsmen who worked together to produce high-quality, functional art objects.
Hoffmann was an influential designer in the Art Nouveau movement and also played an important role in the development of the modernist movement in the early 20th century. He created furniture, decorative objects and buildings, including the interior design of several famous buildings, such as the Villa Skywa-Primavesi in Vienna.
He also taught at the School of Applied Arts in Vienna and influenced many students, including Le Corbusier.
Hoffmann's work was often characterized by a mixture of styles, combining traditional and modern elements to create unique and innovative designs. His contribution to the world of design continues to be recognized and celebrated today.