Horizon3.ai, a leading provider of offensive security solutions, has expanded its global partner leadership structure to support rapidly growing demand for partner-led cybersecurity delivery models. As organizations increasingly rely on managed service providers (MSPs) and strategic partners to operationalize security outcomes, Horizon3.ai is strengthening its channel leadership to drive global scale, partner alignment, and faster go-to-market execution.
As part of this strategic move, Horizon3.ai appointed Tim Mackie as Global Vice President of Worldwide Channels. In this role, Mackie will lead the company’s entire channel and alliance strategy, including partner programs, ecosystem development, and global go-to-market initiatives. At the same time, the company announced that CRN, a brand of The Channel Company, named Marc Inderhees to the prestigious 2026 CRN Channel Chiefs list. Inderhees currently leads MSP and MSSP relationships at Horizon3.ai and plays a key role in expanding partner-driven service delivery.
As cybersecurity threats become more sophisticated and organizations demand measurable, validated security outcomes, partner ecosystems are becoming a critical route to market. Therefore, Horizon3.ai designed this expanded leadership structure to bring greater clarity, stronger execution, and deeper global coordination across alliances, channel programs, and partner enablement strategies.
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“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.”
Mackie brings more than 25 years of experience building high-performing channel organizations across cybersecurity, networking, and enterprise technology. Previously, he held leadership roles at Claroty, Armis, SentinelOne, Cylance, Recorded Future, and Riverbed Technology. Because of this extensive experience, Horizon3.ai expects to accelerate partner adoption and ecosystem expansion across global markets.
“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.”
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Meanwhile, Inderhees continues to lead MSP and MSSP strategy, focusing on partner enablement, co-selling, and service delivery optimization. His inclusion in the 2026 CRN Channel Chiefs list highlights his role in helping managed service providers scale the Horizon3.ai platform and deliver measurable security outcomes to customers.
“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.”
In addition, Ward Holloway, Senior Director of Technology Alliances, continues to lead strategic technology partnerships and integration initiatives. His work strengthens joint go-to-market programs and ensures tight alignment with key ecosystem partners.
Ultimately, Horizon3.ai’s expanded partner leadership structure positions the company to meet accelerating global demand for scalable, outcome-driven cybersecurity. As organizations shift toward partner-delivered security models, Horizon3.ai is building an ecosystem designed to help customers identify risks, validate defenses, and continuously improve their security posture with confidence.
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