Who was the most famous abstract painter during the 20th century?

The most famous abstract painter of the 20th century is often considered to be Jackson Pollock. Known for his pioneering drip painting technique, Pollock's work exemplified the abstract expressionist movement, emphasizing spontaneity and the physical act of painting. His innovative approach and iconic pieces, such as "No. 5, 1948," significantly influenced the direction of modern art. Pollock's legacy continues to resonate, making him a central figure in the history of abstract art.