Which of these artists was active during the 1950s?

Jackson Pollock (born on January 28, 1912, in Cody, Wyoming, U.S.—died on August 11, 1956, in East Hampton, New York) was an American painter who was a leading exponent of Abstract Expressionism, an art movement characterized by the free-associative gestures in paint sometimes referred to as “action painting.” During the late 1940s and early ’50s, Pollock had shows of new paintings nearly every year in New York, his work being handled by Peggy Guggenheim through 1947, the Betty Parsons Gallery from 1947 to 1952, and finally, by the Sidney Janis Gallery.

Source: Britannica