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Defense in Depth

Defense in Depth

By: David Spark Steve Zalewski Geoff Belknap
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Defense in Depth promises clear talk on cybersecurity's most controversial and confusing debates. Once a week we choose one controversial and popular cybersecurity debate and use the InfoSec community's insights to lead our discussion.2018-2024 Spark Media Solutions, LLC Politics & Government
Episodes
  • How Much Cyber Risk Should a CISO Own?
    Dec 11 2025

    All links and images can be found on CISO Series.

    Check out this post by Nick Nolen of Redpoint Cyber for the discussion that is the basis of our conversation on this week's episode co-hosted by me, David Spark, the producer of CISO Series, and Geoff Belknap. Joining us is Erika Dean, former CSO, Robinhood.

    In this episode:

    • Delegation requires accountability
    • The reality of daily decision-making
    • The gap between theory and practice
    • Beyond the advisory role

    Huge thanks to our sponsor, ThreatLocker

    ThreatLocker makes Zero Trust practical. With Default Deny, Ringfencing, and Elevation Control, CISOs get real control that's easy to manage and built to scale. Stop threats before they execute and reduce operational noise without adding complexity. See how simple prevention can be at ThreatLocker.com/CISO

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    33 mins
  • How To Tell When a Vendor is Selling AI Snake Oil
    Dec 4 2025

    All links and images can be found on CISO Series.

    Check out this post by Christofer Hoff of Truist for the discussion that is the basis of our conversation on this week's episode co-hosted by David Spark, the producer of CISO Series, and Caleb Sima, builder, WhiteRabbit. Joining them is Crystal Chatam, vp of cybersecurity, Speedcast.

    In this episode:

    • Understanding the fundamentals
    • The grift of superficial expertise
    • Hands-on experience matters
    • A vulnerability at the leadership level

    Huge thanks to our sponsor, Stellar Cyber

    By shining a bright light on the darkest corners of security operations, Stellar Cyber empowers organizations to see incoming attacks, know how to fight them, and act decisively – protecting what matters most. Stellar Cyber's award-winning open security operations platform includes AI-driven SIEM, NDR, ITDR, Open XDR, and Multi-Layer AI™ under one unified platform with a single license. With ⅓ of the global top 250 MSSPs and over 14,000 customers worldwide, Stellar Cyber is one of the most trusted leaders in security operations. Learn more at https://stellarcyber.ai/.

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    34 mins
  • In the Age of Identity, is Network Security Dead?
    Nov 20 2025

    All links and images can be found on CISO Series.

    Check out this post by Ross Haleliuk of Venture in Security for the discussion that is the basis of our conversation on this week's episode co-hosted by me, David Spark, the producer of CISO Series, and Edward Contreras, senior evp and CISO, Frost Bank. Joining us is Davi Ottenheimer, vp, trust and digital ethics, Inrupt.

    In this episode:

    • Network security isn't dying—it's evolving
    • The observability layer that can't be replaced
    • What's old is new again
    • The innovation gap

    Huge thanks to our sponsor, HackerOne

    Discover how AI innovators like Adobe, Anthropic, and Snap are using AI to find and fix vulnerabilities across the software development lifecycle. HackerOne, the global leader in offensive security solutions, reveals all in the CISOs' guide to securing the future of AI. Download it now to see how AI can strengthen your security posture. Learn more at https://www.hackerone.com/
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    34 mins
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