Final answer:
Paul Cézanne is the Post-Impressionist artist who most influenced the development of Cubism.
Step-by-step explanation:
Paul Cézanne is the Post-Impressionist artist who most influenced the development of Cubism. Cézanne's emphasis on pictorial structure and his use of brushstrokes to create complex areas in his paintings laid the foundations for the transition from Impressionism to Post-Impressionism.