Defense in Depth

David Spark, Steve Zalewski, Geoff Belknap, Edward Contreras

Booking Overview

This weekly cybersecurity interview and debate show examines controversial security issues through conversations with CISOs, security executives, analysts, and cybersecurity vendors. PR agencies could credibly pitch senior security leaders, practitioners with strong positions on emerging threats or security strategy, and credible technology executives; booking difficulty is medium because guests are typically established industry professionals, including sponsored experts.

Metrics

Episodes: 378

Frequency: Weekly

Rating: 4.8/5.0

Estimated listeners: 1k-10k

Gender skew: Male

Location: USA

YouTube: 9.1k subscribers

Contact Information

Publicly listed emails

info@cisoseries.com

Looking for the right person? Join Podseeker to find direct host and producer contacts and manage your podcast outreach.

Host

David Spark - Cybersecurity media producer, journalist, and podcast host.

Steve Zalewski - Cybersecurity executive and podcast host.

Geoff Belknap - Cybersecurity leader and podcast host.

Edward Contreras - Chief information security officer and cybersecurity executive.

Booking Intelligence

Booking Requirements

medium

Typical Credentials:

Senior cybersecurity leaders, CISOs, security executives, technology analysts, and experienced cybersecurity company founders or practitioners with direct operational expertise and informed views on security strategy, vendors, and emerging threats.

Required Achievements:

Leadership of enterprise security programs, Chief information security officer or senior security executive experience, Cybersecurity company founding or executive leadership, Analyst or advisory expertise in cybersecurity, Practical experience with cloud, application, identity, or cyber resilience programs

Recent Guest Discussions

Howard Holton - Cybersecurity Vendor Selection, Organizational Environment, Purchasing Strategy, And Technology Buying Inertia.

Karl Mattson - Cybersecurity Vendor Selection, Organizational Environment, Purchasing Strategy, And Technology Buying Inertia.

Ryan Barrett - Application Security, Artificial Intelligence, Security By Default, Identity, And Integrating Security Into Software Pipelines.

Simon Hughes - Microsoft 365 Security, Cyber Resilience, Backup, Recovery, And Tenant Configuration Protection.

Jill Rhodes - Cybersecurity Vendor Pitches, Relevance, Pricing Security Problems, And Improving Sales Meetings.

Recent Topics

Technology, Cybersecurity, Application Security, Cloud Security, Security Leadership

Episodes

Here's the recent few episodes on

Defense in Depth

Securing AI-Generated Open Source Code

September 24, 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 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 Implicit trust doesn't scale anymore Rethinking what "open" even means A huge thanks to our sponsor, ActiveState Acti...

BONUS EPISODE: Super Cyber Friday Express - Hacking Vendor Selection

September 21, 2026

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 analyst at Phronia Counsel LLC, to discuss how your existing environment shapes what you buy next — and wheth...

How AppSec Needs to Change For the Speed of AI

September 17, 2026

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, not by decision Identity, not just speed Building security into the pipeline, not around it Letting the machine make ...

Publicly listed emails

info@cisoseries.com

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