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Nexum Leadership Team Meet the Nexum leadership team and use the links to connect with us on LinkedIn. David J Lesser Founder, President & CEO David started Nexum in 2002 to create a security products and services firm that puts clients first and foremost. A technologist, businessman, and member of multiple industry advisory boards, David […]

Attack Observations Since the Russian Invasion of Ukraine

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Nearly a month has passed since the start of the Russian invasion of Ukraine. Before this, the “Cold War” of cyberattacks has consisted of plenty of nation-state-sponsored activity against Western targets. But until now, this activity has not been a weaponized component in an active physical conflict with Western countries (whether direct or, in this case, by proxy).

Network Security Engineer

Provides expert-level advice, support, and guidance to Nexum Managed and Monitored services customers. Provides third-tier support to Nexum Authorized Service Center Support customers in the event issues are escalated. Encourages, maintains, and develops a professional business relationship with customers by providing prompt, efficient and professional service at all times. Act as an escalation point for […]

Why Nexum first*defense?

Why Nexum first*defense®? Optimize your resources, defend your investments, and take back your network with Nexum first*defense, our suite of managed and monitored services. We know it’s a constant struggle to find the necessary resources to run your network security operations effectively. Nexum can augment your team’s operations by monitoring for attacks, investigating potential breaches, […]

Staying Ahead of the Curve, Managing Upgrade Paths

Written by George Elgin, Nexum Principal Engineer Our partners at Palo Alto Networks recently acknowledged PAN-OS 10.0.5 as a preferred release in the 10.0 code train. This announcement sparked a conversation with my peers about the general issue of code upgrades, which I thought the greater community might find interesting. For this article, I’m focusing […]


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We Mean Security® Empowering organizations to conduct mission-critical business securely and efficiently The Role of SecurityNexum’s VP of Strategy, Ron Temske, considers the function of security and how it has evolved in the first post of our new Strategy Series. Click HereCelebrating 20 Years of SecurityThe year 2022 marks a massive milestone for Nexum. Founded […]


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Trusted in Security Since 2002 Nexum® is a cybersecurity and networking company that builds and defends global networks, empowering organizations to conduct mission-critical business securely and efficiently. We take a holistic, value-based approach to cybersecurity and networking that includes best-of-breed products, professional services, authorized training courses, manufacturer-authorized support, and monitored and managed services. Founded in […]

Managed Security Services

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Why Nexum first*defense®? It’s a constant struggle to find the necessary resources to effectively run your network security operations. Nexum can augment your team’s operations by monitoring for attacks, investigating potential breaches, proactively blocking bad actors, and keeping essential security components up to date. Nexum is a SOC 2 Type 2-compliant Managed Security Services Provider […]


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Security Assessment Nexum’s risk management services help you identify, evaluate, rate, and remediate security and continuity vulnerabilities. Our experienced engineers can perform a multi-point, holistic health check of your security posture. Vulnerability Assessment Vulnerability assessments help determine your security posture by finding, rating, and documenting vulnerabilities with recommendations to help you remediate or mitigate them. […]