After working for a time in Germany, he left following the Nazi takeover of power in 1933, and spent a number of years in France and the United States.

Although Rabinowitsch was able to produce Robert Z. Leonard's romantic film Maytime for MGM in 1937, his efforts to establish a lasting partnership with American production companies, especially United Artists, were unsuccessful.

A legal dispute initiated by Gregor Rabinowitsch in 1950 in the Federal Republic of Germany over Cine-Allianz Tonfilm GmbH, which had been lost through expropriation, led to the retransfer of ownership and exploitation rights.

Two years later, he founded a production company with the same name in Munich, which was only able to produce a single film before Rabinowitsch's death (Die geschiedene Frau, directed by Georg Jacoby, with Marika Rökk and Johannes Heesters, 1953).

In 1979, the claim of the heirs (Helene Rabinowitsch, Fred Pressburger and Nelly Mandel) for higher compensation was dismissed because both owners of the Cine-Allianz had agreed to the settlement of November 23, 1950 and it was therefore legally binding.