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Olga Kennard, Lady Burgen (née Weisz; 23 March 1924 – 1 March 2023) was a Hungarian-born British scientist who specialised in crystallography. She was the founder of the Cambridge Crystallographic Data Centre.
Kennard's research focused on determining the structures of organic molecules, including the first three-dimensional structure of adenosine triphosphate and particularly the different forms of DNA.Together with JD Bernal she believed in the value of collating scientific data in a central archive, this began the Cambridge Structural Database (CSD), collating crystal structures of mainly organic molecules. Kennard was also involved, at CSD, in the founding of the Protein Data Bank, and of the EMBL nucleotide sequence data library (later, European Nucleotide Archive).