
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 p...
Insights from recent episode analysis
On the show
- Howard Holton2 eps
- Rajan Kapoor1 ep
- Adam Glick1 ep
Also: Ajit Girn, George Finney, Sean Walls, Dave Bittner, Graham Cluley, Leo Laporte, Tyler King, Davi Ottenheimer, Joshua Copeland, Dan Benjamin, Paul Guerra, Steve Jensen
Audience Interest
Podcast Focus
Publishing Consistency
Insights are generated by CastFox AI using publicly available data, episode content, and proprietary models.
Most discussed topics
Brands & references
Total monthly reach
Based on the show's feed history.
Built from
By chart position
- 🇮🇩ID · Technology#1073.6K to 44K
- 🇮🇪Ireland · Technology#991.7K to 21K
- 🇳🇬NG · Technology#1031.6K to 19K
- 🇫🇮FI · Technology#1011.4K to 17K
- 🇨🇴CO · Technology#1311.2K to 14K
- Per-Episode Audience
Est. listeners per new episode within ~30 days
16K to 196K🎙 ~2x weekly·374 episodes·Last published 6d ago - Monthly Reach
Unique listeners across all episodes (30 days)
32K to 392K🇺🇸71%🇮🇩6%🇮🇪3%+12 more - Active Followers
Loyal subscribers who consistently listen
18K to 216K
Market Insights
Platform Distribution
Reach across major podcast platforms, updated hourly
Total Followers
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Total Plays
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Total Reviews
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* Data sourced directly from platform APIs and aggregated hourly across all major podcast directories.
| Date | Episode | Topics | Guests | Brands | Places | Keywords | Sponsor | Length | |
|---|---|---|---|---|---|---|---|---|---|
| 10/15/26 | How Should Security Be Architected for Human Error? | All links and images can be found on CISO Series We've all internalized that humans are the weak link in cybersecurity. Why do we not account for that when we're building our cybersecurity programs? 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 Geoff Belknap. Joining them is their sponsored guest, Kieran Human, lead cybersecurity engineer, ThreatLocker. In this episode: Humans and automation checking each other Assume the click happens Catch it in the moment Take the manual step out entirely A huge thanks to our sponsor, ThreatLocker An AI-generated attack may be new, but it still needs to execute, access data, and move through your environment. ThreatLocker applies enforceable controls at each of those points, limiting what attackers can do regardless of how their code was created. Book a demo at threatlocker.com/ciso. | 25m 18s | ||||||
| 10/8/26 | Can SMBs Get the Same Security as Everyone Else? | 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 ignoring SMB Let the defaults do the work Accountability doesn't get outsourced A huge thanks to our sponsor, ThreatDown ThreatDown MDR is a 24/7/365 security analyst service that explains and resolves suspicious endpoint events. Our team of cybersecurity experts delivers proactive monitoring, investigation, and remediation, catching threats before they escalate. With ThreatDown's always-on protection, organizations gain peace of mind and safeguard their data, reputation, and finances - backed by real analyst expertise, not just automation. Learn more at threatdown.com | 33m 26s | ||||||
| 10/1/26 | Why Do We Keep Complaining About the Same Issues in Cybersecurity? | All links and images can be found on CISO Series 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 week's episode co-hosted by me, David Spark, the producer of CISO Series, and Geoff Belknap. Joining us is Howard Holton, founder, Phronia Counsel. In this episode: The clichés that say nothing A discipline without shared answers Old topics, new lenses A people problem, not a security problem A huge thanks to our sponsor, Teleskope Most DSPMs stop at finding the risk. Teleskope fixes this: it automatically finds sensitive data, including IP documents or board decks, and remediates exposure across cloud, SaaS, and AI environments natively, with human-in-the-loop controls, improving your team's efficiency tenfold. Trusted by Ramp, Polymarket, and Chevron Phillips, and more. teleskope.ai | 33m 41s | ||||||
| 9/24/26 | Securing AI-Generated Open Source Code | 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 ActiveState gives security and engineering teams a single governed source for open source software. With 79 million components built from source, continuously remediated, and delivered directly into the tools teams already use, ActiveState eliminates the CVE backlog and the developer toil that comes with it. Companies see a 60 to 99% reduction in CVEs and reclaim up to 30% of developer time. Learn more at activestate.com. | 35m 00s | ||||||
| 9/21/26 | BONUS EPISODE: Super Cyber Friday Express - Hacking Vendor Selection | 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 whether that's a strategy or just inertia. Watch the full one-hour show at Crowdcast. Subscribe to Super Cyber Friday Express, or any show on CISO Series, at CISOseries.com/subscribe. | 21m 17s | ||||||
| 9/17/26 | How AppSec Needs to Change For the Speed of AI | 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 the fix A huge thanks to our sponsor, ThreatLocker An AI-generated attack may be new, but it still needs to execute, access data, and move through your environment. ThreatLocker applies enforceable controls at each of those points, limiting what attackers can do regardless of how their code was created. Book a demo at threatlocker.com/ciso. | 26m 20s | ||||||
| 9/10/26 | Building Resilience for Microsoft 365 | 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 platform Beyond backup, into resilience What survives the restore Toward a digital twin A huge thanks to our sponsor, CoreView Attackers don't break into Microsoft 365. They log in and reconfigure it. When tenant configurations drift or get tampered with, recovery can take weeks and missed settings can reopen the door. The Cyber Resilience Framework for Microsoft 365 covers the five pillars, harden, govern, detect, respond, recover, and shows exactly where today's tools leave gaps. Download the free practical guide | 27m 43s | ||||||
| 9/3/26 | Recommendations to Reboot the Security Vendor Pitch | 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-minute test Relevance beats format Price the problem or lose the room Whose meeting is it, really A huge thanks to our sponsor, Teleskope Most DSPMs stop at finding the risk. Teleskope fixes this: it automatically finds sensitive data, including IP documents or board decks, and remediates exposure across cloud, SaaS, and AI environments natively, with human-in-the-loop controls, improving your team's efficiency tenfold. Trusted by Ramp, Polymarket, and Chevron Phillips, and more. teleskope.ai | 28m 15s | ||||||
| 8/27/26 | Market Confusion Is Responsible for the Biggest Gaps in Cybersecurity | 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, Frost Bank. Joining is Mary Rose Martinez, CISO, and vp of digital technology services, Marathon Petroleum Corporation. In this episode: Left behind A hypothetical sale The philosophy problem Stop shifting the problems A huge thanks to our sponsor, ActiveState ActiveState gives security and engineering teams a single governed source for open source software. With 79 million components built from source, continuously remediated, and delivered directly into the tools teams already use, ActiveState eliminates the CVE backlog and the developer toil that comes with it. Companies see a 60 to 99% reduction in CVEs and reclaim up to 30% of developer time. Learn more at activestate.com. | 29m 47s | ||||||
| 8/20/26 | Will AI Replace Detection Roles in Cybersecurity? | 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 Ludwig, CSO, Rippling. In this episode: The messy middle The automatable part Where automation stops The influence gap A huge thanks to our sponsor, ThreatLocker ThreatLocker delivers Zero Trust Network Access and Zero Trust Cloud Access that verifies both user and device before granting access to specific applications. No broad access, nothing exposed, and no reliance on credentials alone. It's a smarter way to control access and reduce risk. Learn more at ThreatLocker.com/CISO. | 35m 13s | ||||||
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| 8/13/26 | What Makes a Good AI Security Deployment? | 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 Spark, the producer of CISO Series, and Edward Contreras, senior evp and CISO, Frost Bank. Joining us is Peter Liebert, CISO, Salesloft & Clari. In this episode: Non-determinism changes everything The foundation problem Nobody owns the whole problem The authorization gap A huge thanks to our sponsor, CoreView Attackers don't break into Microsoft 365. They log in and reconfigure it. When tenant configurations drift or get tampered with, recovery can take weeks and missed settings can reopen the door. The Cyber Resilience Framework for Microsoft 365 covers the five pillars, harden, govern, detect, respond, recover, and shows exactly where today's tools leave gaps. Download the free practical guide | 31m 19s | ||||||
| 8/6/26 | The Office Politics of Remediation | 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, Elizabeth Nammour, founder and CEO, Teleskope. In this episode: Data ownership before automation A shared vocabulary for agent risk Maturing from crawl to run Trust earns automation its place A huge thanks to our sponsor, Teleskope Most DSPMs stop at finding the risk. Teleskope fixes this: it automatically finds sensitive data, including IP documents or board decks, and remediates exposure across cloud, SaaS, and AI environments natively, with human-in-the-loop controls, improving your team's efficiency tenfold. Trusted by Ramp, Polymarket, and Chevron Phillips, and more. teleskope.ai | 28m 48s | ||||||
| 7/30/26 | Why is Preventative Security So Difficult? | 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 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 us is Deneen DeFiore, vice president & chief information security officer, United Airlines. In this episode: The sponsorship gap One strike and you're out Policy without position Prevention isn't static A huge thanks to our sponsor, CoreView Attackers don't break into Microsoft 365. They log in and reconfigure it. When tenant configurations drift or get tampered with, recovery can take weeks and missed settings can reopen the door. The Cyber Resilience Framework for Microsoft 365 covers the five pillars, harden, govern, detect, respond, recover, and shows exactly where today's tools leave gaps. Download the free practical guide | 30m 16s | ||||||
| 7/23/26 | Identity and Access Management (IAM) in an Agentic AI World | All links and images can be found on CISO Series 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 Will Gregorian, vp of information technology & security, Galileo Medical. In this episode: From who to what The manipulation problem Cryptographic accountability The audit gap A huge thanks to our sponsor, ActiveState ActiveState gives security and engineering teams a single governed source for open source software. With 79 million components built from source, continuously remediated, and delivered directly into the tools teams already use, ActiveState eliminates the CVE backlog and the developer toil that comes with it. Companies see a 60 to 99% reduction in CVEs and reclaim up to 30% of developer time. Learn more at ActiveState.com. | 30m 20s | ||||||
| 7/16/26 | AI securitycloud workspace+3 | Rajan Kapoor | — | — | AI agentsO365+5 | Material Security | 33m 53s | ||
| 7/9/26 | AI securityhuman-in-the-loop+3 | Howard HoltonAdam Glick | Cortex CloudUpwind Security+2 | — | AI securityhuman-in-the-loop+5 | Palo Alto Networks | 35m 36s | ||
| 7/2/26 | cybersecurity vendorsmarket gaps+3 | Ajit Girn | CISO SeriesREFLEX Solutions+1 | — | cybersecurityvendors+3 | ThreatLockerCODE | 33m 56s | ||
| 6/25/26 | cybersecuritycloud security+3 | George FinneySean Walls | CISO SeriesUniversity of Texas System+1 | — | attackerscybersecurity+5 | Native Security | 27m 40s | ||
| 6/18/26 | cyber mediasuccess in media+4 | Dave BittnerGraham Cluley+1 | Cortex CloudCISO Series+3 | — | cyber mediapodcasting+5 | Palo Alto NetworksCortex | 55m 27s | ||
| 6/11/26 | CISO decision-makingsales strategies+3 | Howard HoltonTyler King | CISO SeriesGigaOm | — | CISOsales+4 | Material Security | 31m 21s | ||
| 6/4/26 | cybersecuritybest practices+4 | Davi OttenheimerJoshua Copeland | CISO SeriesFlying Penguin+1 | — | cybersecuritybest practices+5 | ThreatLockerCISO | 33m 57s | ||
| 5/28/26 | cloud securityAI security+4 | Dan Benjamin | Cortex CloudCISO Series | — | cloud securityAI agents+5 | Palo Alto Networks | 33m 22s | ||
| 5/21/26 | vendor selectioncontract evaluation+3 | Paul Guerra | CISO Series | — | vendor selectioncontract+3 | Native Security | 26m 46s | ||
| 5/14/26 | cybersecuritystartups+3 | Steve Jensen | CISO SeriesCyber Risk Alliance+2 | — | cybersecurityCISO+5 | Material Security | 26m 40s | ||
| 5/7/26 | Breaking the Reactive Cycle of Cybersecurity | 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 huge thanks to our sponsor, ThreatLocker ThreatLocker makes Zero Trust practical. With Default Deny, Ringfencing, and Elevation Control, CISOs get real control that's easy to manage and built to scale. Stop threats before they execute and reduce operational noise without adding complexity. See how simple prevention can be at ThreatLocker.com/CISO. | 31m 52s | ||||||
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Chart history for Defense in Depth
Peaked at #99 in Ireland, currently #99 in Ireland.
| Market | Genre | Peak | Current | Trend |
|---|---|---|---|---|
| Ireland | — | #99 | #99 | — |
| Finland | — | #101 | #101 | — |
| NG | — | #103 | #103 | — |
| ID | — | #107 | #107 | — |
| VN | — | #118 | #118 | — |
| KE | — | #123 | #123 | — |
| CO | — | #131 | #131 | — |
| PH | — | #132 | #132 | — |
| IS | — | #142 | #142 | — |
| Denmark | — | #144 | #144 | — |
| AE | — | #155 | #155 | — |
| SA | — | #155 | #155 | — |
| GR | — | #159 | #159 | — |
| CZ | — | #180 | #180 | — |
| SG | — | #184 | #184 | — |
| PT | — | #185 | #185 | — |
| South Africa | — | #194 | #194 | — |
| HU | — | #198 | #198 | — |
Chart Positions
18 placements across 18 markets.
Chart Positions
18 placements across 18 markets.