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Defense in Depth

CISO Series
Cybersecurity
CISO
Risk Management
Zero Trust
Artificial Intelligence
Vulnerability Management
Data Management
Third-Party Risk Management
Generative AI
Asset Management
Threatlocker
Compliance
Cisos
Social Engineering
Least Privilege
Communication
Hiring Practices
Ransomware
Phishing
Cloud Security

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.

PublishesWeeklyEpisodes372Founded8 years ago
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Latest Episodes

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... more

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What Makes a Good AI Security Deployment?

All links and images can be found on CISO Series

Check out this post by Chris Matthews of UpGuard for the discussion that is the basis of our conversation on this week's episode co-hosted by me, David Sp... more

YouTube

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 o... more

YouTube

All links and images can be found on CISO Series

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 Ross Haleliuk of Venture in Security for the... more

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Key Facts

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Find out how many people listen to this podcast per episode and each month.

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Recent Guests

Lizzie Nammour
Founder and CEO of Teleskope
Teleskope
Episode: The Office Politics of Remediation
Deneen DeFiore
Vice President and CISO, United Airlines
United Airlines
Episode: Why is Preventative Security So Difficult?
Jeroen Levy
CSO of Dolby
Dolby
Episode: Identity and Access Management (IAM) in an Agentic AI World
Will Gregorian
CISO of Galileo Medical
Galileo Medical
Episode: Identity and Access Management (IAM) in an Agentic AI World
Rajan Kapoor
VP Security
Material Security
Episode: Protecting AI Agents in O365 and Google Workspace
Adam Glick
CISO at PSG Equity
PSG Equity
Episode: Humans Are Bottleneck in a Machine-Speed World
Ajit Girn
CIO from Employment Development Department, California
Employment Development Department (California)
Episode: Even With All These Security Vendors We Still Have Glaring Gaps
George Finney
CISO of the University of Texas System
University of Texas System
Episode: Is the "Attackers Only Need to Be Right Once" a Misnomer?
Sean Walls
CISO
Bob's Discount Furniture
Episode: Is the "Attackers Only Need to Be Right Once" a Misnomer?

Hosts

David Spark
Host of Defense in Depth / Producer of the CISO Series; long-time security media professional with broad industry perspective.
Eddie Contreras
Co-host / Senior EVP and CISO at Frost Bank; brings practitioner viewpoint from a financial services context.
Steve Zalewski
Co-host of Defense in Depth; provides enterprise security leadership and advisory perspective.

Reviews

4.8 out of 5 stars from 152 ratings
  • Great show!

    Recently discovered David Sparks’ podcasts, and I can’t get enough. I end up chaining several in a row.

    Apple Podcasts
    5
    JD000000000000000
    United Statesa year ago
  • A superb cybersecurity podcast!

    There is very little else to say. Give it a listen.

    Apple Podcasts
    5
    -CCDeYapp
    United States2 years ago
  • Best cybersecurity podcast out there!

    I listen or have listened to virtually every cybersecurity podcast out there and this one is my favorite by far! Well done folks!

    Apple Podcasts
    5
    Shay Ch
    United States4 years ago
  • Love David’s shows

    David always has great topics and guests. I listen to other security podcasts where there’s only one person speaking…man they’re boring! Not David’s! Always engaging!

    Apple Podcasts
    5
    John Haden
    United States5 years ago
  • Value Added

    If you aren’t listening to these podcasts what are you even doing with your life. Security professionals add value to your core knowledge with these daily injections of absolutely vital industry knowledge and trends.

    Apple Podcasts
    5
    roselinevelee
    United States6 years ago

Listeners Say

Key themes from listener reviews, highlighting what works and what could be improved about the show.

Production quality and balanced guest perspectives are frequently highlighted.
Guests consistently praised for actionable insights and real-world applicability.
Listeners appreciate deep dives with CISOs and security leaders.

Chart Rankings

How this podcast ranks in the Apple Podcasts, Spotify and YouTube charts.

Apple Podcasts
#234
United States/Technology
Apple Podcasts
#136
Canada/Technology
Apple Podcasts
#218
Australia/Technology
Apple Podcasts
#89
Netherlands/Technology
Apple Podcasts
#101
Indonesia/Technology
Apple Podcasts
#132
Israel/Technology

Talking Points

Recent interactions between the hosts and their guests.

What Does the Next Generation of Cloud Security Look Like?
Q: Steve, what will the new SOC look like when AI agents are writing code and responding at machine speed?
The new SOC needs to blend AI-assisted visibility with foundational controls, expanding beyond traditional vulnerability management to include AI-driven incident response, detection engineering, and governance, all while maintaining human oversight and clear ownership.
What Does the Next Generation of Cloud Security Look Like?
Q: What are the things we need to be thinking about when we're dealing with machine fighting machines, Dan?
The discussion centers on integrating AI into security workflow, focusing on securing code at inception, automating remediation, and creating governance that scales with agent speed, while acknowledging limits of current models and the need for visibility into AI agents' actions.
Why Cyber Startups Need CISO Advisors
Q: First, Eddie, do you agree? Have you ever advised startups? And why do you see this as essential?
Eddie confirms that advisory input provides a necessary critique beyond customer feedback, helping startups uncover blind spots and push back on assumptions to shape a product that is viable in real security ecosystems.
Who is Responsible for the Conflict Between Security and Developers?
Q: What is driving the tension between security and development from a leadership perspective?
Leadership incentives and the way organizations measure outcomes shape security and development behaviors more than any single tool or policy.
Don't Try to Win with Technical Expertise. Win by Partnering.
Q: Is this behavior required of all security professionals?
While technical accuracy is vital among security professionals, as they transition to engaging with the wider business, the focus should shift towards influence and building consensus.

Audience Metrics

Listeners, social reach, demographics and more for this podcast.

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Frequently Asked Questions About Defense in Depth

What is Defense in Depth about and what kind of topics does it cover?

This show covers the big tensions and trade-offs in cybersecurity, from strategy and governance to practical defense. Episodes frequently center on how security decisions intersect with business goals, the role of frameworks, vendor dynamics, and the challenges of adopting AI-enabled security in large organizations. Notable are deep dives with CISOs and security leaders across industries, plus ongoing discussions about cloud security, incident response, and how to design security programs that are effective, usable, and aligned with real-world constraints. The format often includes sponsor segments tied to practical frameworks or tools, and the conversations tend to balance theoretical principles with actionable takeaways for practitioners ... more

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How many listeners does Defense in Depth get?

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Which podcasts are similar to Defense in Depth?

These podcasts share a similar audience with Defense in Depth:

1. CISO Series Podcast
2. Cybersecurity Headlines
3. Cybersecurity Today
4. CyberWire Daily
5. SANS Internet Stormcenter Daily Cyber Security Podcast (Stormcast)

How many episodes of Defense in Depth are there?

Defense in Depth launched 8 years ago and published 372 episodes to date. You can find more information about this podcast including rankings, audience demographics and engagement in our podcast database.

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What guests have appeared on Defense in Depth?

Recent guests on Defense in Depth include:

1. Lizzie Nammour
2. Deneen DeFiore
3. Jeroen Levy
4. Will Gregorian
5. Rajan Kapoor
6. Adam Glick
7. Ajit Girn
8. George Finney

To view more recent guests and their details, simply upgrade your Rephonic account. You'll also get access to a typical guest profile to help you decide if the show is worth pitching.

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