Comprehensive Email Security for Microsoft 365 & Google Workspace | Icebreaker

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Comprehensive Email Security for Microsoft 365 & Google Workspace | Icebreaker

Comprehensive Email Security for Microsoft 365 & Google Workspace

Comprehensive Email Security for Microsoft 365 & Google Workspace

GreatHorn is an API, cloud-native email security solution that mitigates the risk of business email compromise across Microsoft 365 and Google Workspace.

5 members

Contact info

Link

greathorn.com

Members

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General Partner at RRE Ventures

Daniel Kelleher

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Experienced engineering leader with a demonstrated track record of scaling teams quickly and delivering large and complex systems from MVP to GA

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As a technology executive, I specialize in transforming ideas into scalable, market-ready solutions that drive growth and resilience. I’ve led the design of strategic product roadmaps projected to increase revenue by 200% within 12 months and implemented robotic automation that reduced resource requirements by 20% in just 4 months. From developing IBM’s CloudBurst platform to spearheading the Watson Health Security Strategy, I’ve consistently delivered innovation across AI, cloud architecture, cyber-security, and risk systems. Over 48 months, I’ve contributed to 30+ patentable technologies, enhancing enterprise security and market competitiveness. My leadership style combines strategic vision with operational discipline—streamlining development cycles, accelerating time-to-market by 3 months, and hiring senior talent to scale high-performance teams globally. Let’s connect if you’re building something bold and need a seasoned technology leader to help shape what’s next.

Catherine Arizan

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Owner and operator, Arro Farm

Matt Petrosky, CISSP

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Versatile leader with 20+ years in technology organizations, designing products and customer experiences, most recently in the rapid-growth cyber security industry.