Which of these artists is most associated with the Dutch abstract art movement 'De Stijl'?

Pieter Cornelis Mondriaan (7 March 1872 – 1 February 1944), was a Dutch painter and theoretician who is regarded as one of the greatest artists of the 20th century. He is known for being one of the pioneers of 20th century abstract art, as he changed his artistic direction from figurative painting to an increasingly abstract style, until he reached a point where his artistic vocabulary was reduced to simple geometric elements.

He was a contributor to the 'De Stijl' art movement and group, which he co-founded with Theo van Doesburg. He evolved a non-representational form which he termed 'Neoplasticism'. This was the new 'pure plastic art' which he believed was necessary in order to create 'universal beauty'. To express this, Mondrian eventually decided to limit his formal vocabulary to the three primary colors (red, blue and yellow), the three primary values (black, white and gray) and the two primary directions (horizontal and vertical). Mondrian's arrival in Paris from the Netherlands in 1911 marked the beginning of a period of profound change. He encountered experiments in Cubism and with the intent of integrating himself within the Parisian avant-garde removed an 'a' from the Dutch spelling of his name (Mondriaan).