Walter Schreiber was born in Berlin to Paul Schreiber (a postal inspector) and his wife Gertrud Kettlitz. After completing gymnasium in Berlin, he studied medicine at the universities of Berlin, Tübingen, and Greifswald. In 1914, he enlisted voluntarily for military service and served with the 42nd Infantry Regiment in France.
Walter Schreiber was born in Berlin to Paul Schreiber (a postal inspector) and his wife Gertrud Kettlitz. Walter attended high school in Berlin before pursuing medical studies at universities such as those of Berlin, Tübingen, and Greifswald. In 1914, he voluntarily entered military service and served with the 42nd Infantry Regiment in France.