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Defense in Depth

Defense in Depth

David Spark, Steve Zalewski, Geoff Belknap 362 Episodes Jun 11, 2026

Defense in Depth is a weekly cybersecurity podcast that tackles controversial and confusing debates in the InfoSec community. Each episode focuses on a single hot topic, leveraging insights from security professionals to drive the discussion. The show aims to provide clear, balanced analysis on issues that divide the industry.

Episodes

CISOs Buy For Selfish and Politically Risk-Averse Reasons (Not Because Your Product is the Best) Jun 11, 2026 31:21 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 operations and response, Sinclair. In this episode: Career insurance In the trenches together Who are you
Has Cybersecurity Become a Cult? Jun 4, 2026 33:57 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 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 Davi Ottenheimer, principal, Flying Penguin. Joining is
What Does the Next Generation of Cloud Security Look Like? May 28, 2026 33:22 All links and images can be found on CISO Series We know human-paced security controls can't be applied to autonomous AI agents. So what needs to change with CNAPP and cloud security? 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, D
The Dangers of Picking the Wrong Vendor May 21, 2026 26:46 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 sponso
Why Cyber Startups Need CISO Advisors May 14, 2026 26:40 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
Breaking the Reactive Cycle of Cybersecurity May 7, 2026 31:52 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 hu
How Do You Know If Your Backups Will Survive a Ransomware Attack? Apr 30, 2026 38:25 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, Heath Renfrow, co-founder, Fenix24. In this episode: Knowing which systems to save first Recovery is a business conversation, not an IT
What Makes a Successful Security Vendor Demo? Apr 23, 2026 26:53 What Makes a Successful Security Vendor Demo? All links and images can be found on CISO Series. Check out this post from Adam Palmer 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 Geoff Belknap. Joining is Ken Beasley, BISO, Kaiser Permanente. In this episode: Show me the problem, not the product Wal
Should You Use Native or 3rd Party Cloud Management Tools? Apr 16, 2026 28:21 Should You Use Native or 3rd Party Cloud Management Tools? All links and images can be found on CISO Series. Check out this post from Steve Zalewski 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 us is their sponsored guest, Gal Ordo, co-founde
How Should We Measure the Performance of a CISO? Apr 9, 2026 29:05 How Should We Measure the Performance of a CISO? All links and images can be found on CISO Series. Check out this post from the cybersecurity subreddit 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 them is Jason Richards, vp, information s
How to Be Less Busy and More Effective in Cyber Apr 2, 2026 26:28 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 Ross Young, co-host, CISO Tradecraft. Joining them is Dan Walsh, CISO, Datavant. Be sure to check out Ross's book Cybersecurity's Dirty Secret: Why Most Budgets Go to Waste. In this epi
How to Engage With a CISO When They Express Interest Mar 26, 2026 31:33 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 them is Adam Palmer, CISO, First Hawaiian Bank. Be sure to check out David's book, Three Feet from Seven Figures: One-on-One Engagement Techniques to Qualify Mor

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