 It was here that he started with a style of action painting, which greatly influenced his Happenings pieces in years to come.He went on to study composition with John Cage in his class at the New School for Social Research, painting with Hans Hofmann, and art history with Meyer Schapiro.Kaprow started his studio career as a painter, and later co-founded the Hansa and Reuben Galleries in New York and became the director of the Judson Gallery.