[2] From 1929, he studied art under Aksel Jørgensen at the Royal Danish Academy of Fine Arts before continuing his education at the Académie Scandinave Maison Watteau in Paris (1933–34) under Othon Friesz, Marcel Gromaire and Charles Despiau.
During the 1930s, Kielberg spent several periods in Odsherred where he created landscapes from Høve to Vejrhøj in addition to a sketch of his friend Karl Bovin wearing a rucksack.
[4][5] His early portraits and landscapes were characterized by Aksel Jørgensen's tight composition while his works from Paris were less rigid and more freely coloured.
His Danish landscapes reveal his friendship with the Odsherred Painters, especially Karl Bovin, Søren Hjorth Nielsen, Victor Brockdorff, Viggo Lørup and Ellen Krause, most of whom were also members of Corner.
[1] Kielberg is remembered first and foremost for the landscapes in all seasons and weathers he painted around Daugløkke near Humlebæk where he lived from 1938.