Charles Guillemet

Charles Guillemet discovered the world of security at the age of 12 when he acquired his first computer. Fascinated by computer systems, he developed a passion for hacking, both as a hobby and for profit. In 2017, Charles joined Ledger as the Director of Security. He founded the “Donjon” team, specializing in research and enhancing the security of Ledger products. In 2019, he was appointed Chief Technology Officer of Ledger. In 2024, under his tech leadership, Ledger expanded its offerings with two innovative devices featuring secure touchscreens: the Ledger Flex and the Ledger Stax.