Paul Cézanne

Paul Cézanne (1839–1906) was a French artist and Post-Impressionist painter whose work laid the foundations of the transition from the 19th-century conception of artistic endeavour to a new and radically different world of art in the 20th century. Cézanne can be said to form the bridge between late 19th-century Impressionism and the early 20th century's new line of artistic enquiry, Cubism. Both Matisse and Picasso are said to have remarked that Cézanne "is the father of us all."
Cézanne's often repetitive, exploratory brushstrokes are highly characteristic and clearly recognizable. He used planes of colour and small brushstrokes that build up to form complex fields. The paintings convey Cézanne's intense study of his subjects. [Source]