Issued from a poor Prussian Jewish family, and raised in Berlin, Nelson began piano lessons at a very young age.

After secondary school, while simultaneously earning a living as an apprentice and subsequently clerk, he received a scholarship from Heinrich von Herzogenberg to the Stern Conservatory.

In 1904, he joined forces with Paul Schneider-Duncker in the famed Chat Noir on Unter den Linden, Berlin’s most fashionable avenue, going on to direct it on his own from 1907 – 1914.

The revues he staged here are legend, presenting numerous top stars of the period, including names such as Josephine Baker, who appeared on 14 January 1926, Weintraubs Syncopators and comic Max Ehrlich.

Forced by the Nazis in 1933 to flee Germany – after stopping for stage appearances in Vienna and Zurich – Nelson founded a new theater troupe in Amsterdam, until after the German occupation he was interned in Westerbork concentration camp.