His Italian father, a professor of singing, was first an engraver before becoming an industrial designer for a jeweler.  When he was 30 years old, a serious illness forced him to go away from Paris. He then started to draw and paint plants, insects and birds around his new and spectacular house. Making lots of money in Paris, he developed a passion for the work of Auguste Raffet, which he published the catalog "racist" in 1862. He worked with Gustave Doré, for which he composed ornaments like "The Holy Bible according to the Vulgate", published in 1866. He contributed drawings to several newspapers, such as Le Monde illustré, Le Magasin pittoresque, and L'Illustration. He also privately illustrated books that brought him wealthy bibliophiles. He was one of the organizers of the exposition of the century prints of 1887 and Section retrospective of Fine Arts, and the Universal Paris Exposition of 1889.
Hector Giacomelli illustrated among others :
- Louis Desnoyers : The Mésaventures Jean-Paul Choppart (1865)
- Jules Michelet :
- The Bird (1867),
- The Bug (1875)
- André Theuriet :
- Nests (1879),
- Sous Bois (1883),
- Our Birds (1886)
- François Coppée: The Illustrated Month (1891)
- Alfred de Musset : istory of a white merle (1904)
- (Eliza Allen Starr) "What We See" 1891
- biographical elements from Joseph Uzanne,AlbumMariani, Librairie Henri Floury, Paris, vol III, 1897, p. 117-119, and Henri Béraldi, The DVD of the nineteenth century, vol VII, 1888, p. 117-119, and Henri Béraldi, The DVD of the nineteenth century, vol VII, 1888, p. 105-108.
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