He had an extraordinarily interesting life (first being a medical doctor, then an opera singer for just a few years, but with enormous success, then an important voice teacher; plus being Jewish & surviving a Nazi concentration camp at almost 70 years old), and I already thought I would have to type it myself, but voilà: I found an excellent website on him (excellent apart from the fact that they are constantly misspelling his name, calling him "Nadolowitsch" in a Germanized version), with an exhaustive biography (written in 1965, when he was still alive!), many pictures, playbills...One of this playbill shows that the French tenor Léon Lafitte sang in Berlin, an unknowh fact. He was born in Dorna-Vatra (Romania, as well - a health resort where his mother was taking a cure at the time when she gave birth to him)
I. Parlophon, Berlin, 1913
I wish to thank Richard J Venezia for the recording.
Source picture: website