Defense in Depth

Defense in Depth

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.

Episodes

October 8, 2026 • 33 mins

All links and images can be found on CISO Series

Check out this post for the discussion that is the basis of our conversation for this week's episode co-hosted by me, David Spark, the producer of CISO Series, and Steve Zalewski. Joining us is their sponsored guest, Mark Stockley, cybersecurity evangelist, ThreatDown.

In this episode:

  • The ripple effect
  • The economics of ign...
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LinkedIn used to have a decent reputation among cybersecurity professionals. But lately, it feels like our feeds are relitigating the same debates every day, just with different faces. Has the situation changed?

Check out this post by Allan Alford of NTT Global Data Centers for the discussion that is the basis of our conversation on this w...

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September 24, 2026 • 35 mins

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 Steve Zalewski. Joining us is our sponsored guest, Abby Kearns, CEO, ActiveState.

In this episode:

  • Trust, but nobody verifies
  • The economics of trust just changed
  • ...
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All links and images can be found on CISO Series

This is a bonus episode of our brand new podcast, Super Cyber Friday Express — a 20-minute highlight version of our live one-hour show we do every available Friday at 1 p.m. Eastern.

In this episode, David Spark is joined by Karl Mattson, founder and managing director of Squared Circle Ventures, and Howard Holton, founder and principal an...

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All links and images can be found on CISO Series

Check out this post by Anand Singh, CSO, Symmetry Systems, 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 Steve Zalewski. Joining us is Ryan Barrett, svp, security, Intermedia Cloud Communications.

In this episode:

  • Risk by default, no...
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September 10, 2026 • 27 mins

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 Brett Conlon, CISO, American Century Investments. Joining us is our sponsored guest, Simon Hughes, vp of field security at CoreView.

In this episode:

  • Ecosystem, not pl...
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All links and images can be found on CISO Series

Check out this post by Val Tsanev of CyberRisk Alliance, 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 Edward Contreras, senior evp and CISO, Frost Bank. Joining is Jill Rhodes, svp, CISO, Option Care Health.

In this episode:

  • The ten-min...
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All links and images can be found on CISO Series

Check out this post from Joe Head of RELEX Solutions 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 Edward Contreras, senior evp and CISO,...

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All links and images can be found on CISO Series

Check out this post from Caleb Sima of Whiterabbit for the discussion that is the basis of our conversation on this week's episode co-hosted David Spark, the producer of CISO Series, and Yaron Levi, CISO, Dolby. Joining is Adrian ...

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What Makes a Good AI Security Deployment?

A

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August 6, 2026 • 28 mins

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 Dan Walsh, CISO, Datavant. Joining is our sponsored guest, Elizabet...

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Prevention in cybersecurity is a lot like flossing: everyone knows they should do it, but few do it enough. What's stopping us?

Check out this post by Ro...

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Check out this post by Tomás Maldonado, CISO, NFL, 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 Yaron Levi, CISO, Dolby. Joining is ...

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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 is their sponsored guest, Rajan Kapoor, vp, security, Material...

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All links and images can be found on CISO Series

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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?

<...

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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...

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What It Takes To Be Successful in Cyber Media

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 ...

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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 Howard Holton, CEO, GigaOm. Joining is Tyler King, senior director - threat operation...

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June 4, 2026 • 33 mins

All links and images can be found on CISO Series

We think of cybersecurity as a discipline. But when do ideas like best practices and NIST frameworks change into a system of belief?

Check ...

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