At the same time, he started painting, and in 1903, aged fifteen, he entered the Royal Academy of Fine Arts in Antwerp, where he was taught by Franz Courtens, and where he won the 1913 de Keyer's Prize.
[1] Because of the First World War, he fled on 9 October 1914 with his wife and child to the Netherlands, where he soon started drawing political cartoons for De Amsterdammer.
Dutch writer A. M. De Jong was impressed by his work and asked him at the end of 1917 to illustrate his juvenile novel Vacantiedagen.
In 1922, De Jong asked him to provide the drawings for the comic strip Bulletje en Boonestaak, which was published between 2 May 1922 and 17 November 1937 in Het Volk, the daily newspaper of the Social Democratic Workers' Party, and in Voorwaarts.
Another comic strip they cocreated was Appelsnoet en Goudbaard, published between 1925 and 1927 in the magazine Blue Band, a purely commercial publication by a butter producer.