Vocation : Science : Biology

Philippe Dautzenberg (20 December 1849, in Ixelles, Brussels – 9 May 1935, in Paris) was a Belgian malacologist, a biologist who specializes in the branch of invertebrate zoology that deals with mollusks. He was an amateur and autodidact, who was actually the owner of a carpet and soft furnishings factory. He was also a devoted family man with 12 children.
He assembled, thanks to his many connections all over the world, a large part of the shell collection of the Royal Belgian Institute of Natural Sciences, which consists of 9,000,000 specimens and is one of the three largest shell collections in the world.
He was a participant in the scientific surveys of Prince Albert I of Monaco and the author of 210 published works (between 1881 and 1937 (post mortem) ) in the field of malacology. He described 1895 new taxa. He collected shells from an early age, resulting in his personal collection of about 4.5 million specimens, relating to 33,000 Recent taxa and 7,000 fossil species. He referenced 82,000 specimens on filing cards.He belonged to several scientific societies in Belgium and France, including the Société royale malacologique de Belgique, Société linnéenne de Lyon (1921–1935) and the Société d'histoire naturelle de l'Afrique du Nord (1926). In 1892 he was named president of the Société zoologique de France.

Jacques Loeb (; German: [løːp]; April 7, 1859 – February 11, 1924) was a German-born American physiologist and biologist.

Charles Marie Benjamin Rouget (19 August 1824 – 1904, Paris) was a French physiologist born in Gisors, Eure. He studied at the Collège Sainte-Barbe with medical training at hospitals in Paris. He was later a professor of physiology at the University of Montpellier (1860). From 1879 to 1893, he was a professor of physiology at the Muséum d’Histoire Naturelle in Paris.Rouget is largely remembered for his correlation of physiology to microscopic anatomical structure. He was the first to discover the branching contractile cells on the external wall of the capillaries in amphibians, structures that are now known as "Rouget cells". Also the eponymous "Rouget's muscle" was described by him, which are circular fibers of the ciliary muscle of the eye. These fibers are sometimes called "Müller's muscle" after German anatomist Heinrich Müller (1820–1864).

Francis Hallé (born 15 April 1938) is a French botanist and biologist. He is a specialist on tropical rainforests and of tree architecture. He is best known for the first "Radeau des cimes" ("Navigating the peaks") he initiated with an aerostatic balloon in 1986. He is a Professor Emeritus of the University of Montpellier.In 2010, he and Luc Jacquet started to collaborate for a Wild-Touch film project, La Forêt des pluies, a documentary about primary forests.

Henri Atlan (born 27 December 1931) is a French biophysicist and philosopher.

Jérôme Jean Louis Marie Lejeune (13 June 1926 – 3 April 1994) was a French pediatrician and geneticist, best known for his work on the link of diseases to chromosome abnormalities, most especially the link between Down Syndrome and trisomy-21 and cri du chat syndrome, amongst several others, and for his subsequent strong opposition to, in his opinion, the improper and immoral use of amniocentesis prenatal testing for eugenic purposes through selective and elective abortion. He is venerated in the Catholic Church, having been declared Venerable by Pope Francis on 21 January 2021.