Jan Tschichold also known as Iwan Tschichold or Ivan Tschichold, was a German calligrapher, typographer and book designer. He played a significant role in the development of graphic design in the 20th century – first, by developing and promoting principles of typographic modernism, and subsequently idealizing conservative typographic structures. His direction of the visual identity of Penguin Books in the decade following World War II served as a model for the burgeoning design practice of planning corporate identity programs. He also designed the typeface Sabon.