Christian Emil Marie Küpper (Spouses: Agnita Feis, Lena Milius, Nelly van Moorsel)  universally known by his pseudonym Theo van Doesburg, was a Dutch painter, architect, writer, and theorist. He is best remembered as the founder and leading spirit of the De Stijl movement, one of the most influential abstract art movements of the early 20th century.

Initially working in a post-impressionist and Fauvist style, Van Doesburg’s artistic trajectory shifted dramatically after encountering the geometric abstractions of Piet Mondrian. In 1917, the two artists, alongside peers like Bart van der Leck and Gerrit Rietveld, founded the De Stijl (“The Style”) movement and its accompanying journal. They advocated for “Neo-Plasticism,” a utopian and universally harmonious aesthetic stripped down to essential geometric forms, utilizing only straight horizontal and vertical lines, and primary colors (red, blue, yellow) alongside black, white, and gray.

As the movement’s chief propagandist, Van Doesburg traveled extensively throughout Europe, lecturing and spreading De Stijl principles to the Bauhaus in Germany and networking with Constructivists. However, his restless and dynamic personality eventually led to a major theoretical rift with Mondrian. In the mid-1920s, Van Doesburg introduced “Elementarism,” a modification of Neo-Plasticism that aggressively introduced diagonal lines to inject dynamic energy into the compositions. This departure from strict horizontals and verticals prompted the purist Mondrian to leave the De Stijl group entirely.

Van Doesburg was a true polymath who refused to be confined to a single medium. He designed stained glass windows, collaborated on major interior architecture projects (most famously the visually striking Café Aubette in Strasbourg), and revolutionized typography. He also secretly embraced the chaotic Dada movement, publishing sound poetry and absurdist literature under the pseudonym I.K. Bonset, and wrote philosophical art essays under another alias, Aldo Camini. He passed away from a heart attack in 1931 at the age of 47, but his multidisciplinary approach fundamentally shaped modern architecture, graphic design, and abstract art.

Active in others filds : Architecture (Interior and Spatial Design), Stained Glass Design, Typography, Poetry and Literature (Dadaism), Art Theory.