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A Practical Roadmap for Real and Lasting Change and a Blueprint for the Next Decade of Cybersecurity Leadership

When a new Chief Information Security Officer steps into the role, the first 100 days can define their legacy. In “The First 100 Days of the New CISO“, seasoned cybersecurity leader and consultant JC Gaillard offers a pragmatic, experience-driven guide to succeeding in those crucial early months — and beyond.

Drawing on over two decades of advising major global organisations, Gaillard helps CISOs, executives, and boards understand what true leadership in cybersecurity looks like: calm, structured, and aligned with business priorities. This is not another technical manual — it’s a leadership guide grounded in governance, culture, and the realities of corporate life.

This is more than a book about the first 100 days. It is a blueprint for the next decade of cybersecurity leadership.