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Defense in Depth

Defense in Depth

By: CISO Series
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Defense in Depth, hosted by David Spark, Steve Zalewski, Geoff Belknap, and Edward Contreras, 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
  • Humans Are Bottleneck in a Machine-Speed World
    Jul 9 2026
    All links and images can be found on CISO Series We're evolving fast to secure AI. But are we evolving fast enough to secure WITH AI? Check out this post by Rinki Sethi, CSO, Upwind 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 Howard Holton, former CEO, GigaOm. Joining is Adam Glick, CSO, PSG Equity. In this episode: Human-in-the-loop math Should machines decide at all From assistant to autonomous Redefining the security role A huge thanks to our sponsor, Palo Alto Networks Cortex Cloud unifies code, cloud, and SOC on a single data, risk, and control plane — giving teams the context, workflows, and agentic intelligence to turn risk into resolution. Native AI agents investigate and act within enterprise guardrails, delivering real-time protection from workload to network edge. Cloud security that outpaces machine-speed threats. Visit paloaltonetworks.com/cortex/cloud.
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    36 mins
  • Even With All These Security Vendors We Still Have Glaring Gaps
    Jul 2 2026

    All links and images can be found on CISO Series

    There are thousands of cybersecurity vendors across categories. If there's a gap in the market, it's likely not for technical reasons. So, how do you actually find vendors that are a good fit rather than one that just meets technical requirements?

    Check out this post by Joe Head of REFLEX Solutions 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 Ajit Girn, CIO, Employment Development Department (EDD).

    In this episode:

    • Built for vendors, not users
    • Signal versus noise
    • Priced out
    • The elegance gap

    A huge thanks to our sponsor, ThreatLocker

    ThreatLocker takes a deny-by-default approach to endpoint security — controlling what applications can run, what can access data, and what can elevate privileges. Used by organizations that want to reduce attack surface without relying on detection alone. Learn more at threatlocker.com/ciso.

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    34 mins
  • Is the "Attackers Only Need to Be Right Once" a Misnomer?
    Jun 25 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 me, David Spark, the producer of CISO Series, and George Finney, CISO, University of Texas System. Joining is Sean Walls, CISO, Bob's Discount Furniture.

    In this episode:

    • Asymmetric accounting
    • Sometimes it really is that easy
    • The spirit of the saying
    • The cheapest way in

    A huge thanks to our sponsor, Native Security

    Native is the Cloud Security Control Plane. It helps enterprises enforce secure-by-design architecture across multi-cloud environments by translating security intent into the cloud provider's built-in controls, previewing impact before rollout, and keeping enforcement aligned as the environment changes.

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    28 mins
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