Defense in Depth

David Spark, Steve Zalewski, Geoff Belknap, Edward Contreras

info@cisoseries.com

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Booking Overview

A weekly cybersecurity debate and interview show that examines controversial information-security issues, typically featuring senior CISOs, CIOs, and other enterprise security leaders as external guests. PR agencies could credibly pitch current or former security executives, technology leaders, and experienced cybersecurity practitioners with strong opinions on enterprise risk, security strategy, vendors, or emerging threats; booking difficulty is medium.

Metrics

Episodes: 366

Frequency: Weekly

Rating: 4.8/5.0

Estimated listeners: 1k-10k

Gender skew: Male

Location: USA

YouTube: 9.1k subscribers

Contact Information

info@cisoseries.com

For verified host and producer emails, sign up to view.

Host

David Spark - Producer and host of Defense in Depth and the CISO Series, focused on practical discussion of controversial cybersecurity issues.

Steve Zalewski - Co-host of Defense in Depth, contributing to discussions of enterprise cybersecurity debates and security strategy.

Geoff Belknap - Co-host of Defense in Depth, contributing to discussions of enterprise cybersecurity debates and security leadership.

Edward Contreras - Senior executive and chief information security officer at Frost Bank, and co-host of Defense in Depth.

Booking Intelligence

Booking Requirements

medium
Typical Credentials:  
Current or former CISOs, CSOs, CIOs, and senior cybersecurity executives with direct responsibility for enterprise security strategy, risk, or technology decisions.
Required Achievements:  
Leading enterprise cybersecurity or information-security programs, Serving as a C-suite or senior security executive, Providing informed perspectives on security strategy, risk, vendors, or emerging threats

Recent Guest Discussions

Adam Glick - Human Decision-making In Machine-speed Security Environments, Autonomous Systems, And Redefining Security Roles

Ajit Girn - Cybersecurity Vendor Selection, Market Gaps, Usability, And Finding Effective Security Solutions

Sean Walls - Attack Asymmetry, Attacker Advantages, Cybersecurity Risk, And The Assumptions Behind Common Security Sayings

Recent Topics

Cybersecurity, Information Security, Security Leadership, Cyber Risk, Cloud Security

Episodes

Here's the recent few episodes on
Defense in Depth
:

Humans Are Bottleneck in a Machine-Speed World

July 09, 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 al...

Even With All These Security Vendors We Still Have Glaring Gaps

July 02, 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 ...

Is the "Attackers Only Need to Be Right Once" a Misnomer?

June 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 i...

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