Guillaume Poupard graduated from Ecole Polytechnique in 1992.
With a degree in weaponry research, he wrote his doctoral thesis on cryptography under the supervision of Jacques Stern at Ecole Normale Supérieure de Paris in 2000.
He also holds a graduate degree in psychology.
He began his career as expert then head of the cryptography lab at Direction Centrale de la Sécurité des Systèmes d’Information (DCSSI). In 2009, the division was transformed, becoming Agence Nationale de la Sécurité des Systèmes d’Information (ANSSI).
In 2006, he joined the Ministry of Defence, continuing to work in governmental cryptography and then in cyber defence.
In November 2010, he was appointed manager of the “information system security” department at the technical division of Direction Générale de l’Armement (DGA), responsible for cyber security expertise and technical policy.
He was appointed Director General of Agence Nationale de la Sécurité des Systèmes d’information on 27 March 2014.