Katz acknowledged and then rejected abstract expressionism and developed his style. He has been called the “artist of the immediate.” Katz himself says he paints “The Artifacts of Culture,” and his work lies in the immediate present. He is an extraordinarily prolific artist and is best known for his portraits, landscapes, and floral paintings; many painted on a huge canvas. His portraits are tightly cropped, and, with a blank background, they focus entirely on the subject. His favorite subject is his wife, Ada, and he has produced over 1000 portraits of her. From the 1980s, he began painting group portraits “to show how people relate to people and showed people touching each other.”