Born in 1943 in Switzerland. Sandreuter studied under Armin Hofmann at the Allgemeine Gewerbeschule in Basel. After graduating he moved to Milan, where he worked for a couple of years collaborating with Studio Coppola. In 1969 he went to London to work at Crosby/Fletcher/Forbes. While there he designed the poster and catalogue for Kinetics, the group show organized by Theo Crosby for the Hayward Gallery. In 1972-73 Sandreuter was involved in major social projects designing the graphics for the campaign to ‘Save Piccadilly’ Circus from redevelopment and for the campaign to save the Royal Agricultural Hall in Islington. Meanwhile, he went freelance, mostly working for arts client such as a community arts organization called Inter-Action, the Serpentine Gallery, the Arts Council, and the ICA. In 1976-77 he was commissioned by art curator Sir Nicholas Serota to design all the printed matter for the Whitechapel Gallery, including numerous posters and the gallery’s newssheet.