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.

[8] Gräff's paternal ancestors were politically active and religious free thinkers with their own coat of arms,[4] who belonged to an extramarital branch of the dutch noble and patrician family (De) Graeff.

[9] Since 2010, Gräff has been in a civil partnership with Greek-born Georgia Kazantzidu,[5] a Webster Vienna Private University graduate, local SPÖ politician and journalist, with whom he runs various joint projects.

[11] In 2001, at the age of 17, he began to study illustration and graphic at the private New Design University St. Pölten,[12] and in the following years he took part at the summer academy of Geras of Bernhard Hollemann.

[23] A local businessman boycott the publishing of the etiquettes about the illustration of a half naked woman, and this led to a little media scandal in Austria.

Various of these paintings have also been used in essays by historians, including Asle Toje, member of the Norwegian Nobel Committee,[42] and german university professor Ronald G.

[45][33] Important topics are anti-fascism, socialism, anti-nationalist and pro-European,[33] He also deals with socio-political issues and critical processes in Austrian society and politics.

In relation of the 2019 European Parliament election, Gräff created a pro-European painting in collaboration with the Austrian party NEOS.

[46] The Erich Maria Remarque-Friedenszentrum (University of Osnabrück) wrote about Gräff: He consistently represents humanistic, anti-nationalist and pro-European positions both in his art and in various exchange and discussion programs organized by him.

[47][48] Matthias Laurenz Gräff has been politically active as a community representative in Gars am Kamp for the Austrian liberal parliamentary party NEOS since 2022.