Guillaume Cornelis van Beverloo whose pseudonym was Corneille, was born in Liege, Belgium on 3 July 1922. His parents were Dutch and moved back to the Netherlands when he was 12. Corneille studied art at the Academy of Art in Amsterdam. He was one of the founders of the REFLEX movement in 1948 and in 1949 he was also one of the founders of the CoBrA movement, which has had great influence on Scandinavian art. He was active within the group from the start, not only painting but also publishing poetry in the CoBrA magazine. He was a co-founder of the Experimentele Groep in Holland. He lived in Paris for many years and died there on 5 September 2010.