[3] In 1994, Deynat continued his doctoral research on the systematic and taxonomic applications of the skin covering of Pristiformes and Rajiformes, which he completed with a 15-day stay at the American Museum of Natural History in New York City and at the Smithsonian Institution in Washington.

Deynat's aquaphobia caused the mission to fail, and he was then forced to leave his host laboratory to find work as a salesman with the bookstore Gibert Joseph.

In 2000, while handling the CD-ROMs of a paleontology database named Paleobase, Deynat had the idea of creating Odontobase to identify and catalog the odontodes (cutaneous denticles, spines and loops) of all species of chondrichthyans.

[7] In parallel with his activities, the Gibert Joseph bookstore authorized him to present a photographic exhibition of electron microscopy called "Shark on edge", produced jointing with the National Museum of Natural History.

[9] This discovery allowed him to re-emphasize his research with the mainstream press, and raise public awareness of pinning by participating in a debate organized in 2007 as part of the Jules Verne Aventures Festival.

[14] Since 2016, Deynat has been working on writing articles that he had left pending, and continuing his collaborations with scientific organizations in the enrichment of Odontobase and the identification of objects covered with skins of sharks and rays.

[16] In 2016, he was proposed to join the jury for the "taste of science" prize, organized since 2009 by the Minister of Higher Education, Research and Innovation, alongside biologist Pierre-Henri Guyon and prehistorian Marylène Pathou-Mathis.