Hippolyte Bayard (born 1801) is said to have invented photography earlier than the Fox Talbot and Daguerre, the men who are credited with inventing the process, but was persuaded to postpone the unveiling  of his findings by a man who was a friend of Daguerre and was working to sabotage Bayard. 

The first photograph is a portrait of the man himself, the second is a portrait he took in 1846 of a construction worker in Paris.