![oil on canvas](/sites/default/files/styles/signpost_image/public/teaser-images/john-armstrong-2-bmagg-k4467.tiff%20%282%29.jpg?itok=k0HoxeyA)
![oil on canvas](/sites/default/files/styles/signpost_image/public/teaser-images/john-armstrong-2-bmagg-k4467.tiff%20%282%29.jpg?itok=k0HoxeyA)
Ralf Winkler, alias A. R. Penck, who also used the pseudonyms Mike Hammer, T. M., Mickey Spilane, Theodor Marx, "a. Y." or just "Y" (5 October 1939 – 2 May 2017) was a German painter, printmaker, sculptor, and jazz drummer. A neo-expressionist, he became known for his visual style, reminiscent of the influence of primitive art.
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