Paul Signac was a French Neo-Impressionist painter who, alongside Georges Seurat, developed the technique of Pointillism. After Seurat's death, Signac became the movement's leading advocate, writing the influential theoretical treatise 'From Eugène Delacroix to Neo-Impressionism.' His vibrant port scenes and seascapes use mosaic-like dabs of pure color to create shimmering, luminous effects.