Steve Sharma is a Principal Cybersecurity Architect and the Founder and Director of Cybersecurity Link, based in Melbourne, Australia. He advises boards, CISOs, and senior security leaders on governing artificial intelligence safely - from risk assessment and policy through controls, monitoring, and incident response. He is the creator of the CISO's Decision Journey, the five-stage framework (Assess, Govern, Defend, Monitor, Improve) at the heart of this book. The CISO's AI Firewall distils that field experience into a practical, vendor-neutral playbook for securing large language models before the breach.