Back in the Netherlands, he decided to become an artist and went to Paris, where he studied at the Académie Julian.
From sculptor John Rädecker he learned stone carving under Bart van Hove.
[3] In 1911–1912, he spent the winter in Berlin, where he studied art under Georg Kolbe and then traveled from Rome to Paris, where he lived with the painter Jacob Bendien and met the sculptor Ossip Zadkine.
[3] At the end of 1912, he returned to Amsterdam where he learned wood carving in the furniture company of A.M.
For instance, he designed exterior figures on the Scheepvaarthuis by Amsterdam School architects Johan van der Mey, Piet Kramer and Michel de Klerk are his.
[3] Krop's work was included in the 1939 exhibition and sale Onze Kunst van Heden (Our Art of Today) at the Rijksmuseum in Amsterdam.
The art nouveau villa Rams Woerthe in Steenwijk has rooms that feature a varied collection of his work.
[3] Krop became a member of the Social Democratic Labour Party in 1908, but out of enthusiasm for the October Revolution and disappointment with social-democratic support for World War I (specifically, an advertisement for German war bonds in Het Volk) he switched allegiances to communism.
[citation needed] In 1921, he designed the cover for Henriette Roland Holst's book Soviet Russia.