| |
| Film credits |
| |
| EINE VERSUNKENE WELT / A VANISHED WORLD | Austria, 1922 | author of original work |
| FORBIDDEN PARADISE | US, 1924 | original novel |
| EVE'S SECRET | US, 1925 | original play |
| THE SILENT LOVER / MEN OF THE DAWN | US, 1926 | author of original work |
| HOTEL IMPERIAL | US, 1927 | original play |
| THE LAST COMMAND | US, 1928 | original story |
| ADORATION | US, 1928 | story |
| THE YELLOW LILY | US, 1928 | story; adaptation |
| WOMEN EVERYWHERE / HELL'S BELLES | US, 1930 | screenplay |
| THE GHOST TRAIN | 1931 | screenplay |
| THE FAITHFUL HEART / FAITHFUL HEARTS | 1932 | screenplay |
| WEDDING REHEARSAL | 1932 | original story |
| SERVICE FOR LADIES / RESERVED FOR LADIES | 1932 | screenplay |
| THE GIRL FROM MAXIM'S | 1933 | continuity |
| THE PRIVATE LIFE OF HENRY VIII / OH HENRY | 1933 | story; dialogue |
| STRANGE EVIDENCE / WIFE IN PAWN / DANCE OF WITCHES | UK/US, 1933 | original story |
| KISÉRTETEK VONATA / GHOST TRAIN | Hungary, 1933 | original scenario |
| THE PRIVATE LIFE OF DON JUAN / EXIT DON JUAN | 1934 | story; dialogue |
| CATHERINE THE GREAT / THE RISE OF CATHERINE THE GREAT | 1934 | original play |
| SANDERS OF THE RIVER / KONGO RAID | 1935 | screenplay |
| THE SCARLET PIMPERNEL | 1935 | scenario; continuity; dialogue |
| THE MAN WHO COULD WORK MIRACLES / THE MIRACLE MAN | 1936 | screenplay (uncredited) |
| REMBRANDT | 1936 | screenplay (uncredited) |
| DARK JOURNEY / THE ANXIOUS YEARS | 1937 | screenplay |
| KNIGHT WITHOUT ARMOUR | 1937 | screenplay |
| THE RETURN OF THE SCARLET PIMPERNEL | 1937 | adaptation |
| UNDER THE RED ROBE | 1937 | screenplay |
| THE DIVORCE OF LADY X | 1938 | adaptation |
| THE DRUM / THE DRUMS | 1938 | adaptation |
| THE FOUR FEATHERS | 1939 | additional dialogue |
| HOTEL IMPERIAL | US, 1939 | original play |
| OVER THE MOON | 1939 | original story |
| THE THIEF OF BAGDAD | 1940 | scenario |
| FIVE GRAVES TO CAIRO | US, 1943 | original play |
| A ROYAL SCANDAL / CZARINA | US, 1945 | original play |
| AN IDEAL HUSBAND | 1947 | screenplay |
| STORM OVER THE NILE / THE FOUR FEATHERS | 1955 | additional dialogue |
