Theo van Doesburg (Dutch: [ˈteːjoː vɑn ˈduzbʏr(ə)x], 30 August 1883 – 7 March 1931) 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 married to artist, pianist and choreographer Nelly van Doesburg.