Tim Mackie appointed to lead worldwide channels and alliances, and Marc Inderhees named a 2026 CRN® Channel Chief

Horizon3.ai, the leading provider of offensive security solutions, today announced an expansion of its global partner leadership team to support accelerating MSP- and partner-led growth. As part of this expansion, the company appointed Tim Mackie as Global Vice President of Worldwide Channels to lead all channel and alliance strategy. The company also announced that CRN®—a brand of The Channel Company—has selected Marc Inderhees, who oversees MSP and MSSP relationships at Horizon3.ai, for inclusion on the prestigious 2026 CRN® Channel Chiefs list.

As Horizon3.ai scales to meet growing demand for security outcomes that can be operationalized at scale, managed service providers and strategic partners have become a critical route to market. The expanded leadership structure is designed to bring greater focus, clarity, and execution across partner programs, alliances, and go-to-market motions worldwide.

“Tim has a rare combination of strategic vision and hands-on execution,” said Matt Hartley, Chief Revenue Officer at Horizon3.ai. “He brings decades of experience and a global network to scale all aspects of the GTM ecosystem. As demand for validated security outcomes grows, Tim’s leadership will be critical to expanding our global footprint through trusted partners. This structure gives our partners clear ownership, strong support, and a direct path to delivering measurable outcomes for customers through MSPs and managed services.”

In his role, Mackie oversees Horizon3.ai’s worldwide channel and alliance strategy, including partner programs, global go-to-market execution, and ecosystem development. He brings more than 25 years of experience building high-performing channel organizations across cybersecurity, networking, and enterprise technology, with prior leadership roles at Claroty, Armis, SentinelOne, Cylance, Recorded Future, and Riverbed Technology.

“At Horizon3.ai, the technology is already changing how organizations think about exposure and validation,” said Mackie. “My focus is on enabling partners to deliver that value at scale, helping customers move faster from finding risk to fixing and verifying it. This is a partner-led growth opportunity, and I’m excited to build the ecosystem that supports it. That includes empowering leaders like Marc to deepen our MSP motion, so partners can operationalize security outcomes consistently and at scale.”

Reporting within this structure, Inderhees leads Horizon3.ai’s MSP and MSSP strategy and execution, focusing on partner enablement, co-selling, and partner-delivered services. His work empowering managed service providers to deliver the Horizon3.ai platform at scale earned him inclusion on CRN’s prestigious 2026 Channel Chiefs list, which recognizes IT vendor and distribution executives who are shaping channel strategy and driving innovation across the industry.

“MSPs and MSSPs are on the front lines of helping organizations improve their security posture,” said Inderhees. “Being recognized by CRN is an honor, and it reflects the momentum we’re seeing as partners adopt and operationalize our platform to deliver measurable outcomes for their customers.”

Also reporting within the global partner organization, Ward Holloway, Senior Director of Technology Alliances, leads Horizon3.ai’s strategic and technology alliance initiatives, strengthening integrations and joint go-to-market efforts with key ecosystem partners.

About Horizon3.ai

Horizon3.ai’s NodeZero® platform is trusted by over 40% of the Fortune 10, the world’s largest banks, top global pharmaceutical and semiconductor manufacturers, critical infrastructure operators around the globe, and the U.S. Defense Industrial Base to proactively find, fix, and verify exploitable vulnerabilities to continuously fortify cyber defenses and improve cyber resilience. The fastest-growing cybersecurity company in America (Inc. 5000, Deloitte Fast 500), Horizon3.ai was founded by a mix of U.S. Special Operations veterans and industry experts and is headquartered in San Francisco.

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About The Channel Company

The Channel Company (TCC) is the global leader in the channel growth for the world’s top technology brands. We accelerate success across strategic channels for tech vendors, solution providers, and end users with premier media brands, integrated marketing and event services, strategic consulting, and exclusive market and audience insights. TCC is a portfolio company of investment funds managed by Eagle Tree Capital, a New York City-based private equity firm. For more information, visit thechannelco.com.

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