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Jef Diederen (1920 -2009) was a Dutch painter and graphic artist.
Diederen was one of the so-called Amsterdam Limburgers.
He attended the Secondary School of Arts and Crafts in Maastricht from 1939 to 1943,
Jef continued his education (Drawing) at the Rijksakademie van Beeldende Kunsten in Amsterdam in 1943. There Diederen met Ger Lataster, Karel Appel and Corneille as his fellow students.
Until 1955 he painted mainly landscape gouaches, drawings. They are mostly realistic landscapes from his native region of South Limburg.
His later paintings are considered abstract art.