The famed painter Edvard Munch, who had rented lodgings with the family during the summers of 1885 and 1886, lent painting materials to the boy and encouraged his artistic efforts.

[2] From 1898 to 1899 Deberitz was a pupil of Oscar Wergeland at the Norwegian National Academy of Craft and Art Industry (Kunst- og Håndverksskole) in Kristiania.

After the dissolution of that marriage, in 1909 he remarried Selma Harriet Aas (born 14 November 1876), daughter of brewery owner Poul Lauritz Aass and Christine Sophie Landmark.

Deberitz broke through at the 1914 Jubilee Exhibition at Frogner with, among others, his work Badende gutter (Bathing Boys, 1914).

Here he exhibited together with leading artists of the time, including Henrik Sørensen, Axel Revold, Per Krohg and Jean Heiberg.