Nelly van Doesburg

Nelly van Doesburg (née van Moorsel; 27 July 1899 – 1 October 1975) was a Dutch avant-garde (dada) musician, dancer and artist. As a painter, she used the pseudonym "Cupera". 
Biography.
Nelly van Moorsel was born on 27 July 1899 in The Hague. 
She was a life long champion of De Stijl movement and advisor to notable American art collector, bohemian and socialite Peggy Guggenheim. 
In 1920 she met Theo Van Doesburg through her brother, who had a subscription to the magazine "De Stijl", published by Van Doesburg. During the opening of the La Section d'Or exhibition in The Hague on 11 July 1920, she would immediately fell in love with him. Her Catholic parents did not appreciate the association with Van Doesburg, who was not only Protestant, but also married. She ran away from home around the turn of the year from 1920-1921 and was received in Leiden by J.J.P. Oud and Van Doesburg's wife Lena Milius. During her relationship with Van Doesburg she was introduced to the world of modern art. Van Doesburg took her on a lecture tour through Europe in March 1921, during which they also visited Piet Mondriaan in Paris.
From April 1921 she lived with Van Doesburg in Weimar. In December she spent a few weeks in Vienna to reflect on her future. Here she met the Hungarian artist Lajos Kassák, publisher of the magazine Ma. Aktivista Folyóirat (Present Activists Magazine). After this a correspondence between Kassák and Theo van Doesburg arose.
On 24 September 1922 she visited with Theo, Cor van Eesteren and others, the Städtische Kunstverein by Walter Dexel in Jena. The following day she played compositions by Vittorio Rieti during a dada evening at Hotel Fürstenhof in Weimar, in which Jean Arp and Tristan Tzara also participated.
In January-February 1923 she participated with her future husband and the artists Kurt Schwitters and Vilmos Huszár, under her stage name Pétro, on the Dutch Dada tour. During these evenings she played music by Satie and Rieti. After this tour, she played compositions by Arthur Honegger, Daniël Ruyneman, Francis Poulenc, Josef Hauer and Egon Wellesz during a "Modern Soirée" on 12 March at the Lily Green dance school in The Hague. The Taste of Style Art by the composer Jakob van Domselaer also featured in her repertoire. In addition, under the pseudonym Cupera she made a number of paintings, in which influences from De Stijl can be recognized. In Paris she enjoyed some fame as a dancer as Sonia Pétrowska.
From 2 October 1929 to 5 January 1930 she organized the ESAC (Expositions Sélectes d'Art Contemporain) of "contemporary young Parisian painting" at the Stedelijk Museum in Amsterdam and Pulchri Studio in The Hague. Van Doesburg also participated in this exhibition under her pseudonym P. Cupera.
After Theo van Doesburg's death, widow Nelly van Doesburg committed herself to keeping the memory of her husband alive. She wanted to help the one-sided image, that he was primarily a follower instead of an innovator of modern art, out of the world. To this end, she organized a series of exhibitions of his work. She also provided a good shelter for a large part of his paintings by selling them to the best collections of modern art in the world. Many paintings by Van Doesburg ended up in the United States, for example in the Museum of Modern Art and the Guggenheim collections, because Van Doesburg was friends with Peggy Guggenheim, who acted as her agent in America. In the fifties she also made some reproductions in silkscreen of her husband's works. Van Doesburg's remaining collection, consisting mainly of archive material, studies, photographs and drawings, left Nelly van Doesburg to her cousin Wies van Moorsel, who donated it to the Dutch Nation in 1981. The collection is managed by the Netherlands Institute for Cultural Heritage and the Netherlands Institute for Art History.
She also remained active in the artists' circuit. She had a short relationship with the German architect Ludwig Mies van der Rohe. She was also, as an important witness of the entire Stijl movement, a good source for, among others, the book Holland Dada by K. Schippers. At the end of her life she returned to her roots and she became Catholic again.
It is rumoured that Nelly van Doesburg had an affair with Jazz musician Thelonious Monk who she met whilst in at the Minton's Playhouse, and continued the relationship in the De Stijl house in Meudon.
Nelly van Doesburg died at the age of 76 from the consequences of breast cancer in the home and studio designed by Theo van Doesburg in Meudon, France.