John-Erik Horn

Defending IT, OT, and AI. From Policy to Code.

Munich, Bavaria, Germany

About

John-Erik has proven his unique mixture of technology competence and business acumen in various leadership positions within multi-national corporations, SMEs, and professional services companies. He has executed projects on three continents carrying commercial and technical responsibility, and repeatedly led intercultural teams. Professional consulting has been a natural part of his career over various domains and industry sectors. He is competent in information security, IT management, and digitalization. His main academic degrees, MSEE (Dipl.-Ing.) and MBA, are complemented by his CISSP certification.

Experience

  • CEO at difesa GmbH & Co. KG
    Jan 2023 - Present · 3 yrs 7 mos

  • Interim CISO at Atreus GmbH
    Feb 2022 - Dec 2025 · 3 yrs 11 mos

    - CISO positions in mid-size enterprise companies with ca. 1bn € rev. - Manufacturing and energy sectors - Operations in multiple European countries, headquarters in Germany

  • Managing Director at BDO Cyber Security GmbH
    Jul 2020 - Jan 2022 · 1 yr 7 mos

  • Managing Director at BDO DIGITAL GmbH
    Jul 2020 - Jan 2022 · 1 yr 7 mos

  • PwC Deutschland (3 yrs 1 mo)
    • Director Cyber Security
      Jul 2019 - Jun 2020 · 1 yr

    • Senior Manager Cyber Security
      Jun 2017 - Jun 2019 · 2 yrs 1 mo