Holly Grace Williams

Penetration Tester and Technical Lead

Holly Grace has been working in cybersecurity since 2007, with a focus on penetration testing and cybersecurity consultancy.

Holly Grace is a CREST Fellow and has been a CREST Certified Application Tester since 2015. She has professional software development experience in Python and Rust, including taking software products to market. She has strong experience in building and securing cloud environments, with a focus on AWS and Azure.

She has performed a significant number of penetration testing engagements for a wide range of companies from innovative start-ups to multinational corporations, in fields ranging from e-commerce to banking.

She’s also often found speaking at conferences and on podcasts all about technology, cloud computing, cybersecurity, chaos engineering, and more.


  • MSc Information Security, Cardiff University
  • CREST Certified Web Application Tester (CCT-App)
  • CompTIA Network+
  • CompTIA PenTest+
  • CompTIA Cloud+
  • CompTIA Security+
  • CompTIA Network Vulnerability Assessment Professional
  • CompTIA Secure Cloud Professional
  • CompTIA Cloud Admin Professional
  • Amazon AWS Machine Learning Specialty
  • Amazon AWS Security Specialty
  • Amazon AWS Cloud Practitioner
  • Microsoft Azure Fundamentals

Previous Certifications

  • CREST Registered Tester
  • Cisco CCNP
  • Cisco CCNA: Security
  • Cisco CCNA: Routing and Switching
  • Cisco CCENT
  • Juniper JNCIA
  • CompTIA A+


  • CREST Fellowship (2023)
  • SC UK’s 30 Women of Influence (2021)
  • SC UK’s 50 Women of Influence (2019)
  • Computing’s Security Excellence Award (2018)

Media Appearances

  • Sky News, August 2023
  • Sky News, April 2021
  • Sky News, August 2020
  • BBC Breakfast, July 2020
  • BBC Breakfast, January 2020
Play Cover Track Title
Track Authors