Marie Neurath, born Marie Reidemeister (27 May 1898 – 10 October 1986), was a member of the team that developed the Vienna Method of Pictorial Statistics (Wiener Methode der Bildstatistik), which she later renamed Isotype. She was also a prolific author and designer of educational books for younger readers. Her brother was mathematician Kurt Reidemeister. She was born in Braunschweig.
Reidemeister studied mathematics and physics from 1917 to 1924 in Göttingen, while also taking courses at the "Kunstschule" in 1919. Just before graduating she met Otto Neurath and soon moved to Vienna. In 1925 she began work at the Gesellschafts- und Wirtschaftsmuseum in Wien (Social and economic museum of Vienna). The museum was founded to communicate the city's social reform programme to the public. This was the start of her long activity as the main "transformer" (in English, one would now say designer) working with Otto Neurath in the teams that made graphic displays of social information, an early form of information design.
The other essential member of the Neurath group, the German artist Gerd Arntz, joined in 1928. Marie Reidemeister worked at this museum in Vienna until the brief civil war in Austria in 1934, moving then with Neurath (a prominent Social Democrat) and Arntz (who had allegiances to radical-left groups) to The Hague. A new name was needed for the Vienna Method now that its original context was left behind: Marie Neurath developed the acronym Isotype (International System Of TYpographic Picture Education) in 1935 on the analogy of Charles Kay Ogden’s “Basic English”. It was intended as a method of pictorial statistics that could clarify scientific relationships for non specialists. Large data volumes were translated in a comprehensible and memorable visual form. The data was illustrated and interconnections were to be presented, the result was a promoted democratisation of knowledge. Neurath collected the information, Arntz developed the pictograms and graphics and Reidemeister converted the information and data into a visual understandable presentation. She linked technical experts and graphic designers as well as the target audience. Otto Neurath called this position the "trustee of the public".