Jules-Alexandre Grün was a French painter, illustrator and poster artist active in the late 19th and early 20th centuries.
Grün painted the social life of paris, dinner parities and grand celebrations, and designed posters for theatre and other events.
There is a blog devoted to his poster work, Jules-Alexandre Grün: The Posters, with a bio.
Toward the end of his career, Grün was suffering from Parkinson’s disease; Donald Pittenger has a post on the painting of Grün’s last crowd scene on his blog Art Contrarian (see this post’s comments).