Louis Sébastien Tredern de Lézérec
Louis Sébastien Marie de Tredern de Lézérec (14 September 1780 – 8 November 1818) was a French biologist, physician, and pioneer embryologist who examined the growth of the chicken embryo. His 1808 medical dissertation Dissertatio Inauguralis Medica Sistens Ovi Avium Historiae et Incubationis Prodromum (preliminary contribution to the history of the avian egg and its incubation) on the embryo of the chick was examined by Karl Ernst von Baer and is considered a landmark in the history of vertebrate embryology.