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Johannes (Jan) Korthals (Amsterdam, 1 May 1916 - ibid., 4 June 1972) was a Dutch painter who worked in the impressionist style. Korthals' style is strongly influenced by his great examples, Breitner and Mackenzie. The latter was also Korthals' uncle and played a stimulating role in his life. Korthals' work covers many cityscapes, particularly Amsterdam and Paris. He also worked extensively on commission to illustrate calendars and other printed matter. Jan Korthals received his artistic training at the Gerrit Rietveld Academy in Amsterdam and the Royal Academy of Fine Arts in Antwerp. His teachers were Hendricus IJkelenstam and Jos Rovers.