1888 – Born on the 23rd of January in Berlin, Germany.

1905 – He began his higher education in physics, chemistry, and mathematics at Gonville and Caius College
                   in Cambridge, England.

1906 – He continued his formal education at the University of Göttingen, Göttingen, Germany.

1907 – He continued his mathematical studies at the Ludwig Maximilians University of Munich, Munich, Germany.

1912 – He was granted his doctorate.

1921 – He published a paper on the theta function method of analyzing dipole fields in crystals.

1922 – He was called to the University of Münster, Münster, Germany.

1929 – He received a call to the Technische Hochschule Hanover, Germany.

1932 – He was was elected Rector at Stuttgart.

1933 – He resigned his position as a Rector at Stuttgart.

1937 – He emigrated to England and took a research position in Cambridge.

1939 – He accepted the offer as a lectureship at Queen’s University Belfast, Northern Ireland.

1944 – He proposed the establishment of an International Union of Crystallography.

1946 – He was elected Chairman of the Provisional International Crystallographic Committee.

1948 – He chaired the first General Assembly and International Congress of the International Union

               of Crystallography.

1949 – He moved to United States and took a position at the Polytechnic Institute of Brooklyn, New York

                  City, U.S.A.

1952 – He was elected as a President of the American Crystallographic Association.

1957 – He served as a Vice-President of International Union of Crystallography.

      – He retired as head of the Physics Department in Polytechnic Institute of Brooklyn.

1959 – He retired from teaching.

1960 – He served as a President of International Union of Crystallography.

1985 – He died on the 22nd of August in Ithaca, New York, United States.