Paul Jackson Pollock (January 28, 1912 August 11, 1956), known as Jackson Pollock, was an influential American painter and a major figure in the abstract expressionist movement. During his lifetime, Pollock enjoyed considerable fame and notoriety. Pollock was introduced to the use of liquid paint in 1936 at an experimental workshop operated in New York City by the Mexican muralist David Alfaro Siqueiros. He later used paint pouring as one of several techniques on canvases of the early 1940s, such as "Male and Female" and "Composition with Pouring I." After his move to Springs, he began painting with his canvases laid out on the studio floor, and he developed what was later called his "drip" technique, turning to synthetic resin-based paints called alkyd enamels, which, at that time, was a novel medium. Pollock described this use of household paints, instead of artists paints, as "a natural growth out of a need." He used hardened brushes, sticks, and even basting syringes as paint applicators. Pollock's technique of pouring and dripping paint is thought to be one of the origins of the term action painting. With this technique, Pollock was able to achieve a more immediate means of creating art, the paint now literally flowing from his chosen tool onto the canvas. By defying the convention of painting on an upright surface, he added a new dimension by being able to view and apply paint to his canvases from all directions. One possible influence on Pollock was the work of the Ukrainian American artist Janet Sobel (18941968) (born Jennie Lechovsky). Sobel's work is related to the so-called "drip paintings" of Jackson Pollock. Peggy Guggenheim included Sobel's work in her The Art of This Century Gallery in 1945. The critic Clement Greenberg, with Jackson Pollock, saw Sobel's work there in 1946, and in his essay "American-Type' Painting" Greenberg cited those works as the first instance of all-over painting he had seen, stating that "Pollock admitted that these pictures had made an impression on him".
In the process of making paintings in this way, he moved away from figurative representation, and challenged the Western tradition of using easel and brush. He also moved away from the use of only the hand and wrist, since he used his whole body to paint. In 1956, Time magazine dubbed Pollock "Jack the Dripper" as a result of his unique painting style.