Theo van Doesburg was a Dutch artist, who practiced painting, writing, poetry and architecture. He is best known as the founder and leader of De Stijl.
He was born Christian Emil Marie Küpper on 30 August 1883, in Utrecht, the Netherlands, as the son of the photographer Wilhelm Küpper and Henrietta Catherina Margadant.
Originally van Doesburg intended to pursue a career in the theatre, but he turned to painting about 1900. He worked in Post-Impressionist and Fauvist styles until 1915, when he discovered Piet Mondrian’s work, which persuaded van Doesburg to paint geometric abstractions of subjects from nature. His paintings, with their strict use of vertical and horizontal shapes and primary colours, closely resembled Mondrian’s until about 1920. In 1917 van Doesburg was instrumental in forming the De Stijl group of artists, and he also founded the avant-garde art review De Stijl (a publication that was continued until 1931). Among the artists involved with De Stijl was the Dutch architect J.J.P. Oud, for whom van Doesburg first designed stained-glass windows in 1916. His collaborations with architects continued throughout his career, as he went on to design more stained glass, as well as floor tiles and overall colour schemes.