May 12, 1889
Born in Frankfurt am Main (Germany).
1908/1909
Studies economics in Heidelberg (Germany).
August 1909-1911
Leaves for New York to gain work experience at Macy’s department store and in a bank.
August 1915
Otto is drafted into the military.
1917
Otto is promoted to the rank of army lieutenant.
May 12, 1925
Otto marries Edith Holländer in Aachen (Germany).
February 16, 1926
Margot Frank is born.
June 12, 1929
Anne Frank is born.
Summer 1933
Edith, Margot and Anne go to live with their grandmother in Aachen. Otto travels on to Amsterdam.
September 1933
Otto sets up the Opekta company and becomes director.
1938
The Pectacon company is also set up, and Otto becomes director.
December 1940
Opekta and Pectacon move to Prinsengracht 263.
December 1941
Jews are forbidden to own their own businesses, so Otto appoints Mr Kleiman and Mr Kugler as directors, but remains in charge behind the scenes.
July 6, 1942
The Frank family goes into hiding.
June 25, 1947
Otto gets the diary published in the Netherlands.
1952
Otto moves to Basel (Switzerland).
November 10, 1953
Otto marries Elfriede (Fritzi) Markovits.
May 3, 1960
Otto attends the opening of the Anne Frank House.
August 19, 1980
Otto dies in Basel (Switzerland).