Roger Legrand was a French engineer working at the Guiana Space Centre in Kourou during the 1980s. He is the author of Lancement d'Ariane au Centre spatial guyanais (1985), a popular-science book written from inside the launch base: drawing on his first-hand knowledge of launch operations, he walks the general reader, step by step, through an Ariane launch campaign, from payload preparation to orbital injection. Technically accurate yet deliberately accessible, his text borrows its chapter titles from Guianese Creole, underlining the book's strong local roots. Biographical information about him remains scarce: neither his dates nor his detailed career are documented in common public sources.