Paul Cassirer and Walter Feilchenfeldt
| 1898 – 1937 | Kunstsalon Paul Cassirer, Berlin |
| 1898 - 1901 | Kunstsalons Bruno & Paul Cassirer, Berlin |
| 1901- 1937 |
Kunstsalon Paul Cassirer, Berlin |
| 1919 |
Walter Feilchenfeldt (1894 - 1953) enters the firm |
| 1924 | Walter Feilchenfeldt and Grete Ring (1887 - 1952) become partners |
| 1926 | Death of Paul Cassirer; Walter Feilchenfeldt and Grete Ring run the business |
| 1933 | Emigration of Walter Feilchenfeldt to Amsterdam. Transformation of Paul Cassirer Berlin into a private company under the direction of Grete Ring |
| 1937 | Liquidation of Paul Cassirer, Berlin |
| 1923 – 2011 | N.V. Amsterdam’sche Kunsthandel Paul Cassirer |
| 1923 | Founding of the Paul Cassirer Amsterdam branch. Directed by Helmuth Lütjens (1893 - 1987) |
| 1937-1939 | Head office of the firm Paul Cassirer |
| 2011 | Closing of the Paul Cassirer branch in Amsterdam |
| 1938 – 1975 | Paul Cassirer Ltd., London |
| 1938 | Founding of a Paul Cassirer branch in London. Directed by Grete Ring |
| 1952-1975 | Directed by Marianne Feilchenfeldt (1909 – 2001) |
| 1975 | Closing of the London branch Paul Cassirer Ltd. |
| 1948 – 2011 | Kunsthandlung Walter Feilchenfeldt, Zurich |
| 1948 - 1953 |
Directed by Walter Feilchenfeldt sen. |
| 1951 – today | Member of the Swiss Art Trade Association (KHVS) |
| 1953 - 1966 |
Directed by Marianne Feilchenfeldt |
| 1966-1990 | Directed by Marianne and Walter Feilchenfeldt jun. |
| 1990-2011 | Directed by Walter Feilchenfeldt jun. |
| 2011 – today | Transformation of the firm into: Walter Feilchenfeldt AG Art Negociation & Research |
