Monotype Type Drawing Office 1928. Gill studied under the renowned calligrapher, Edward Johnston, the designer of the London Underground sans serif typeface. This influenced Gill who later experimented with sans serif designs, and in due course produced a set of capital letters. These became Monotype series 231, produced in 1923, and the forerunner of the extensive Gill Sans range now available. A twentieth century sans serif that has a simplicity of form which does not reject traditional forms and proportions, and gives the face a humanist feel. The lighter weights are highly readable in text and suitable for magazine and book work, whereas the heavier weights are best used for display in advertising, packaging, and labels.