MOVEMENT CENTERED AROUND THE BETTY PARSONS GALLERY KNOWN AS ABSTRACT EXPRESSIONISM . HE WROTE AND LECTURED EXTENSIVELY ON ART AND WAS A MAJOR INFLUENCE ON CONCEPTUAL , MINIMAL ART AND MONOCHROME PAINTING . MOST FAMOUS FOR HIS "BLACK" OR "ULTIMATE" PAINTINGS, HE BELIEVED IN A PHILOSOPHY OF ART HE CALLED ART-AS-ART