JEAN S. DEUT SCH, is Emeritus Professor of Genetics and Animal Biology, Université Pierre et Marie Curie, Paris 6, Department (UMR 7622) “Biologie du Développement”. Under the supervision of Prof. P.P. Slonimski, he participated to the birth of mitochondrial genetics of the yeast Saccharomyces cerevisiae. During the ‘80s, he moved to the Institut Jacques Monod in Paris to study developmental genetics of Drosophila melanogaster, focusing on the genetics of the hormonal control of metamorphosis. In 1993, he was the first in France, together with André Adoutte, to undertake evo-devo studies, choosing the cirripedes, which have been Darwin’s favourite animals, as a model, because of their so peculiar body plan. In a second step, his team studied the developmental genetics of other arthropods, including scorpions and pycnogonids. He is author of a number of scientific publications in international journals, and of three textbooks in French on Drosophila and genetics.