British artist (paintings, reliefs, prints, material art) of the post-war constructivist movement who, as Achill Redo, did neo-Dadaist works.

He is also known for a strong inclination to mathematics. In cooperation with Frieder Nake he defined the Mondrian graphs, a class of graphs that are models of the well-known structures of horizontal and vertical bars painted by Piet Mondrian in his neoplastic period.