Was Caillebotte a patron, collector, or painter in his own right?
Millet
He never aspired to be an impressionist, but painted many works plein air, with loose brushwork, and conveying impressions.
Grigorescu showed progressive evolution of his style, from Barbizon through Impressionism, and is the founding father of modern Romanian art.
The main German impressionist painters followed the French Impressionists, with Liebermann and Slevogt continuing to use the style well into the twentieth century.
If anyone led Impressionism during the 1860s and early 1870s, it was surely Jongkind.
A simply golden landscape at sunset, by the central figure in Impressionism and father of Post-Impressionism.
The Eclectic Light Company 