When was the Dutch artist who was part of Art Concret born? 
Art Concret:  It consisted of Otto G. Carlsund, Theo van Doesburg, Jean Hélion, Marcel Wantz and Léon Arthur Tutundjian. Theo van Doesburg: Theo van Doesburg (] , 30 August 1883 – 7 March 1931) was a Dutch artist, who practiced painting, writing, poetry and architecture.
30 August 1883