As a child, he received music and violin lessons from Heinrich Bandler, then concertmaster of the Hamburg Philharmonic Orchestra.
Moritz lived in Berlin and from there he went on concert tours as a violinist and later mainly as a guest conductor in other cities and abroad (England, France, Spain, Portugal and Italy).
In 1934 he gave house concerts with chamber music in Hamburg as a violist; in 1934/1935 he was conductor of the newly founded Jewish chamber orchestra in Hamburg, in which well-known Jewish professional musicians and soloists participated, such as Ilse Urias, Jakob Sakom and Hertha Kahn.
In September 1937 he travelled with a visa from Gothenburg on the ship S.S. Königstein (Arnold Bernstein Line) from Antwerp to New York.
His New York debut was st Town Hall on 2 May 1938 with the Edvard Moritz Chamber Orchestra.