Who painted this painting?

"Ad" Reinhardt (1913 -1967) was an abstract painter active in New York. Reinhardt is best known for his so-called "black" paintings of the 1960s, which appear at first glance to be simply canvases painted black but are actually composed of black and nearly black shades. Among many other suggestions, these paintings ask if there can be such a thing as an absolute, even in black, which some viewers may not consider a color at all.