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. After finishing high school in Berlin, he studied medicine at the universities of Berlin, Tübingen, and Greifswald. In 1914, he voluntarily enlisted for military service and served with the 42nd Infantry Regiment in France.