Piet Mondrian (1872-1944) was a Dutch painter and pioneer of abstract art, born in Amersfoort. A key figure in the De Stijl movement, Mondrian profoundly influenced modern art with his geometric abstraction and commitment to a universal visual language. His early works, influenced by Post-Impressionism, evolved into the iconic neoplastic style characterized by grids, primary colors, and a rejection of representational forms. Notable pieces include "Composition with Red, Blue, and Yellow" (1930). Mondrian's theories on art and spirituality culminated in his development of "neoplasticism," an aesthetic advocating harmony through pure abstraction. Forced into exile during World War II, Mondrian's impact continued to resonate globally. His legacy endures as a foundational force in the evolution of abstract and geometric art.