He made 110 paintings and drawings during the First World War while interned as a German civilian internee in Great Britain and the Isle of Man.

[1][2] Kenner was born Georg Kennerknecht on November 1, 1888, in the small town of Schwabsoien, near the Alps in the Weilheim-Schongau district of Bavaria, Germany.

[3][4] Being a trained commercial artist by profession, and wanting to stay in practice with his work, he negotiated with the PoW camp authorities to be allowed to create what became the most extensive collection of World War I internment scenes known.

[1][4] Many of his drawings, hand-written journal, business card, Lambeth School of Art tuition slips, immigration and "alien enemy" registration documents were accepted into the Imperial War Museum in London, in October 2005.

[7] Several of Kenner's paintings from his Frith Hill PoW camp period were used in the book Reflections – A Heatherside Miscellany by Nick McCormick, published in June 2006.

[8] Several other paintings from Kenner's Alexandra Palace PoW period were used in the book Ally Pally Prison Camp by Maggie Butt, published in June 2011.