Piet Zwart (1885 – 1977) was a Dutch photographer, typographer, and industrial designer. He started his career as an architect and worked for Jan Wils and Berlage.
As a designer, Zwart was well known because of his work for both the Nederlandse Kabelfabriek Delft (the Dutch Cable Factory in Delft) and the Dutch Postal Service (PTT), and as a pioneer of modern typography.
He did not adhere to traditional typography rules, but used the basic principles of constructivism and De Stijl in his commercial work. His work can be recognized by its primary colors, geometrical shapes, repeated word patterns and an early use of photomontage.