Derogy started his career as a journalist by writing for
Franc-Tireur and ''L'Intransigeant
. He wrote for L'Express from 1959 to 1987, and subsequently for L'Evenement du Jeudi''. During one of his investigations, he uncovered the criminal past of
Paul Touvier during
World War II. He also wrote about Israel. Derogy was the author of many books. ==Death==