Camille Pissarro
An Impressionist turned pointillist—and great teacher of other painters
Jacob Abraham Camile Pissaro (1830-1903) was a Danish-Jewish-Creole-Portuguese-French (whew!) landscapist, born on the Caribbean island of St. Thomas, who taught Cézanne, Gauguin, and Cassatt.
He later, at the age of 54, took on many of the divisionnist/pointillist ideas of some younger protoges like Seraut and Signac.
Fun trivia: He was the only artist to exhibit at all eight Paris Impressionist exhibitions, from 1874 to 1886.