John Ernest (May 6, 1922 – July 21, 1994) was an American-born constructivist abstract artist.
As a mature student at Saint Martin's School of Art he came under the influence of Victor Pasmore and other proponents of constructivism.
Several of his works are held at Tate Britain, including the Moebius Strip sculpture.
[3] He designed both a tower and a large wall relief at the International Union of Architects congress, South Bank, London, in 1961.
Ernest had a lifelong fascination with mathematics that is reflected in his work and, together with constructivist artist Anthony Hill, made contributions to graph theory, studying crossing numbers of complete graphs.