Vija Celmins (born October 25, 1938) is a Latvian American artist, sculptor, and printmaker best known for her photo-based drawings and paintings.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Vija_Celmins
Letter by Vija Celmins / 1968
Collage and graphite on acrylic ground on paper / 13-1/4″x18-1/8″ / Matthew Marks Gallery, NY & LA
Vija Celmins on Artnet: http://www.artnet.com/artists/vija-celmins/