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Matthias Laurenz Gräff (also known as Matthias Laurenz Gräff Ilpenstein; born 19 July 1984) is an Austrian-Greek academic painter, private historian, politician, political activist and co-founder and organizer of the non-partisan platform Dialog im Kamptal. Since 2013 Gräff has served as chairman of the worldwide Family Association Gräff-Graeff and since 2024 as the official Representative of the NEOS parliamentary party for Greece.