Keith Haring Mixed media on cardboard 11 1/4”x 8 1/4 Keith Haring Mixed Media on Cardboard. Private Collection. 11.25" x 8.25". Signed: Keith Allen Haring (May 4, 1958 - February 16, 1990) was an American artist and social activist whose work responded to the New York City street culture of the 1980s by expressing concepts of birth, death, sexuality, and war. Haring\'s work was often heavily political and his imagery has become a widely recognized visual language of the 20th century.