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Hippolyte Bayard, born 20 January 1801 in Breteuil-sur-Noye, died 14 mai 1887 in Nemours, was the inventor of a photographic process.

Since 1837 he could produce persisting photograms by means of his self-developed direct positive process^[1]. Thus he was one of the inventors of photography since its invention was officially acknowledged in 1839 by the French government, but Daguerre and Niépce named as its official inventors.

Bayard applied for acknowledgement of his invention just before that official proclamation. He even organised the World's first public exhibition of photographs in the Salle des Commissaires-prisseurs in Paris, one month before the government's proclamation.

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But Arago, the responsible officer and member of the academy of science, neglected Bayard's efforts. 30 paper images achieved by Bayard's direct positive process were shown at the exhibition.

For his 1840 self-portrait he mimed a drowned person.

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