London, November 10^th 2025 — International cybersecurity advisor and industry thought-leader JC Gaillard today announced the release of his new book, The First 100 Days of the New CISO: A Leadership Guide to Lasting Impact. This groundbreaking work provides the first truly pragmatic roadmap designed to help Chief Information Security Officers (CISOs) navigate their early months in role and convert their mandate into long-term organisational influence.

At a time when cyber threats dominate board agendas and regulatory pressure is intensifying globally, CISOs are under unprecedented scrutiny. Yet most guidance remains reactive or technology-driven: The First 100 Days of the New CISO shifts the conversation to where it truly belongs: Leadership, governance, culture, and the ability to drive maturity in complex corporate environments.

Addressing a Critical Leadership Gap

As organisations increasingly rely on digital platforms, cloud ecosystems and AI-driven services, cybersecurity is no longer optional — it is a pillar of business trust, investor confidence, and operational continuity. Yet many CISOs are still appointed into roles with unclear expectations, fragmented governance, and insufficient authority.

The First 100 Days of the New CISO tackles this challenge head-on, helping leaders establish control, align stakeholders, and create a platform for real and sustainable transformation.

A New Blueprint for Security Leadership

Drawing on over two decades of direct field experience running a global cybersecurity practice or advising global organisations through Corix Partners, JC Gaillard introduces a structured leadership framework based on the first six days, six weeks, and six months of a new CISO’s tenure. Rather than promoting unrealistic “quick wins,” the book emphasises credibility and trust before change, proportionate action, and a structured rhythm that builds lasting value creation.

“Too many security leaders burn political capital in pursuit of instant impact. The first 100 days are not about acting fast — they’re about listening, building trust and acting right.” said JC Gaillard. “This book provides CISOs with the structure, language, and mindset they need to build influence that lasts beyond their tenure.”

What Makes the Book Stand Out

• A leadership-first approach — cybersecurity presented as an executive discipline, not a technical function.


• No jargon, no hype — every chapter written in pragmatic business language for CISOs, CIOs, CEOs, and board members.


• Real-world insight — based on first-hand advisory work with FTSE 100 and Fortune 500 firms.


• Strategic outcomes, not tactical checklists — to help leaders build trust, secure alignment, and embed resilience at scale.

About the Author

JC Gaillard is the Founder and Managing Director of Corix Partners, a boutique management consultancy specialising in cybersecurity transformation, and Founding Member of the Security Transformation Research Foundation, an independent think tank focused on driving long-term maturity in cybersecurity. He is widely recognised as one of the foremost voices on leadership, culture, and governance in the cybersecurity industry. He has previously published:

• The Cybersecurity Spiral of Failure – and How to Break Out of It, LeadersPress, 2023


• The Cybersecurity Leadership Handbook for the CISO and the CEO, LeadersPress, 2023-2024


• Cybersecurity: The Lost Decade, The Security Transformation Research Foundation, 2017-2021

Availability

The First 100 Days of the New CISO: A Leadership Guide to Lasting Impact is available now in paperback and eBook formats via Amazon.

Media Contact

Press Inquiries:
Email: contact@corixpartners.com

Website: https://corixpartners.com/

Author Contact:
LinkedIn: https://www.linkedin.com/in/jcgaillard/

Twitter: @Corix_JC