Guillaume D
Guillaume D is a co-founder of BeHack and is based in Brussels. He took up that role in May 2022. Since September 2025 he has been an ambassador for Cresco Cybersecurity, having co-founded the company in June 2020 and led its hackers until September 2025. He has also owned Deterville consulting since August 2019.
Before that he co-founded Redcactus in May 2019, where he was cybersecurity leader until June 2020. He co-founded the Cyber Security Agency in January 2017 and served as its operations officer until May 2019, and in April 2017 he co-founded Machinerycash, working as its cyber strategist until December 2018.
He studied economics at the institut de l'Assomption from 2011 to 2016, obtaining a CESS.
Career
Roles
Cresco CybersecurityAmbassadorSep 2025 – Present
- Deterville consultingCompany OwnerAug 2019 – Present
BeHackCo-founderMay 2022 – Mar 2026
- RedcactusCo-founder & Cybersecurity leaderMay 2019 – Jun 2020
- Cyber Security AgencyCo-founder & operations officerJan 2017 – May 2019
- MachinerycashCo-founder & Cyber strategistApr 2017 – Dec 2018
Education
- institut de l'assomptionCESS, Économie2011 - 2016
From public career histories · 8 entries