Hans Oliva-Hagen

Hans Oliva-Hagen ( Hagen; 14 April 1922 – 1992) was a journalist, writer, and screenwriter in the German Democratic Republic who wrote under the pseudonyms Hans Oliva and John Ryder. His most important works include his collaboration on the scripts for the DEFA film ''Carbide and Sorrel'' (1963) and the five-part GDR television film ''Conscience in Riot'' (1961). A militant opponent of fascism and a Holocaust survivor of partial Jewish heritage, Oliva-Hagen was active in the German resistance to Nazism. Provided by Wikipedia