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Marc-Julian Siewert is the CEO of secunet Security Networks, a leading IT security company in Germany. Passionate about safeguarding Europe's digital freedom, he drives digital sovereignty, cloud infrastructure, and international growth. His leadership is focused on empowering teams, partners, and customers to protect critical digital infrastructures.
Who is the CEO of secunet Security Networks?
Before becoming the CEO of secunet Security Networks, Marc-Julian Siewert built a distinguished career in technology and identity solutions. He served as Chief Executive Officer (CEO) at Veridos from January 2022 to July 2025, and prior to that as Chief Operating Officer at Veridos from August 2019 to January 2022. Earlier in his career, he held the role of Vice President - Key Account at Papierfabrik Louisenthal GmbH. His broad leadership experience across operations, key account management, and executive roles has equipped him with the expertise to drive secunet's mission of protecting critical digital infrastructures and advancing digital sovereignty.
Work History
Marc-Julian Siewert's work history includes a range of significant leadership positions. Here is a list of the roles he has held:
- secunet Security Networks - CEO, July 2025 – Present
- Veridos - Chief Executive Officer (CEO), January 2022 – July 2025
- Veridos - Chief Operating Officer, August 2019 – January 2022
- Papierfabrik Louisenthal GmbH - Vice President - Key Account, March 2013 – December 2016
Education History
Marc-Julian Siewert holds a qualification in Management from IE Business School, an internationally renowned institution. This academic foundation has supported his development as a senior executive across multiple industries.
When did Marc-Julian Siewert join secunet Security Networks?
Marc-Julian Siewert assumed the role of CEO at secunet Security Networks in July 2025. He brings with him a strong track record of executive leadership, most recently as CEO of Veridos, and a clear commitment to driving digital sovereignty, cloud infrastructure, and international growth at secunet.
