I’ve spent the last 20 years working in offensive security, with a strong focus on Windows research and exploitation, red teaming, and developing training labs. I also deliver live training sessions to help others build their skills. Currently I’m Director of Offensive Content Engineering at Hack The Box. Previously I worked as a red teamer at Mantodea Security and built lab environments at Vulnlab.

You can usually find me at conferences in Asia such as Zer0Con, POC, TyphoonCon and CODE BLUE, or in Europe at x33fcon and OffensiveCon.

Outside of security, I love exploring Japanese language and culture.

Certifications

• Offensive Security Exploitation Expert (OSEE)
• Offensive Security Exploit Developer (OSED)
• HTB Certified Active Directory Pentesting Expert (CAPE)
• Certified Red Team Lead (CRTL)
• Certified Red Team Operator (CRTO)
• Offensive Security Experienced Penetration Tester (OSEP)
• Offensive Security Web Expert (OSWE)
• Offensive Security Certified Expert (OSCE)
• Offensive Security Certified Professional (OSCP)
• Certified Information Systems Security Professional (CISSP)

Trainings

• 2026 - macOS Vulnerability Research @ Zer0Con by Gergely Kalman
• 2025 - AI Agent Security Masterclass @ CODE BLUE Japan by Abhay Bhargav
• 2024 - Modern Initial Access and Evasion Tactics @ mgeeky
• 2023 - Linux Kernel Exploitation @ OffensiveCon by Andrey Konovalov
• 2023 - Azure AD Security @ RomHack by Dirk-jan Mollema
• 2023 - Red Team Operator: Malware Development Advanced @ Sektor7
• 2022 - Red Team Lead (CRTO2) @ Zero-Point Security
• 2022 - Windows Internals @ Pavel Yosifovich
• 2022 - Advanced Windows Exploitation @ OffSec
• 2022 - Malware Development Intermediate @ Sektor7
• 2021 - Windows User Mode Exploit Development @ OffSec
• 2021 - Red Team Operator (CRTO) @ Zero-Point Security
• 2020 - Deep Learning Specialization by Andrew Ng @ Coursera
• 2019 - SAP Cyber-Security for IT Security Practitioners @ 44Con
• 2019 - SANS660 – Advanced Penetration Testing, Exploit Writing, and Ethical Hacking
• 2019 - SANS760 – Advanced Exploit Development for Penetration Testers
• 2018 - Advanced Software Exploitation @ Ptrace Security
• 2018 - Vulnerability Discovery and Triage Automation @ OffensiveCon
• 2015 - Reverse Engineering with IDA Pro @ BlackHat EU
• 2015 - Windows & Linux Kernel Debugging @ Linux Hotel