| 1898 – 1937 | Kunstsalon Paul Cassirer, Berlin |
| 1898 | Founding of the Kunstsalon Bruno & Paul Cassirer, Berlin |
| 1901 | Conversion to Kunstsalon Paul Cassirer, Berlin |
| 1919 | Walter Feilchenfeldt (1894 – 1953) enters the firm |
| 1924 | Walter Feilchenfeldt and Grete Ring (1887-1952) become partners of the firm |
| 1926 | Death of Paul Cassirer; head of the firm: Walter Feilchenfeldt |
| 1933 | Resignation of Walter Feilchenfeldt from the Berlin firm; head of the firm: Grete Ring |
| 1937 | Liquidation of the Kunstsalon Paul Cassirer, Berlin |
| 1923 – 2011 | Amsterdam’sche Kunsthandel Paul Cassirer |
| 1923 | Founding of the Amsterdam branch. Directed by Helmuth Lütjens (1893-1987) |
| 1937-1939 | Head office of the firm Paul Cassirer |
| 2011 | Closing of the business |
| 1938 – 1975 | Paul Cassirer Ltd., London |
| 1938 | Founding of a London branch. Directed by Grete Ring |
| 1952-1975 | Directed by Marianne Feilchenfeldt (1909-2001) |
| 1975 | Closing of the business |
| 1948 – 2011 | Kunsthandlung Walter Feilchenfeldt, Zurich |
| 1948 | Opening the art dealing firm Walter Feilchenfeldt, Zurich Directed by Walter Feilchenfeldt (1894 – 1953) |
| 1951 – today | Member of the Swiss Art Trade Association (KHVS) |
| 1953 | Death of Walter Feilchenfeldt; head of the firm: Marianne Feilchenfeldt |
| 1966-1990 | Directed by Marianne and Walter Feilchenfeldt (1939) |
| 1990-2011 | Directed by Walter Feilchenfeldt (1939) |
| 2011 – today | Transformation of the firm into: Walter Feilchenfeldt AG Kunstvermittlung & Kunstforschung |