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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
  • The Dangers of Picking the Wrong Vendor
    May 21 2026

    All links and images can be found on CISO Series.

    Check out this post 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 Steve Zalewski. Joining us is our guest, Paul Guerra.

    In this episode:

    • Read the contract
    • How vendors win before the evaluation ends
    • The fallout
    • The real cost

    A huge thanks to our sponsor, Native Security

    Native makes secure-by-design inherent to how the cloud operates. It's the control plane for built-in cloud security, unifying and governing native controls, so security intent is defined once and applied consistently across providers. Learn more at native.security.

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    27 mins
  • Why Cyber Startups Need CISO Advisors
    May 14 2026

    All links and images can be found on CISO Series

    All security startups will tell you they talk to potential customers. The problem is that you limit your development when you only talk to CISOs who might buy. It's not the same guidance you'll get from a CISO who advises.

    Check out this post by Val Tsanev of the Cyber Risk Alliance for the discussion that is the basis of our conversation.

    This week's episode is co-hosted by me, David Spark, the producer of CISO Series, and Edward Contreras, senior evp and CISO, Frost Bank. Joining us is Steve Jensen, CISO, University of Maine System.

    In this episode:

    • Building for whom?
    • The only feedback loop that matters
    • Valid, but for whom?
    • Rethink the advisor roster

    A huge thanks to our sponsor, Material Security

    Legacy email security only watches the door. Material protects your entire cloud workspace—email, files, and accounts—as one ecosystem. It's more coverage for less than the cost of a legacy SEG. One price, no surprises: just security that covers the whole surface area. Learn more at material.security.

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    27 mins
  • Breaking the Reactive Cycle of Cybersecurity
    May 7 2026

    All links and images can be found on CISO Series.

    Check out this post 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 Steve Zalewski. Joining us is our sponsored guest, Rob Allen.

    In this episode:

    • The vulnerable stack
    • Changing the structural economics
    • Change the terrain
    • The cost-benefit equation

    A 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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    32 mins
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