CornerStone Strategy LLC
Cornerstone Strategy works with technology companies to transform their AWS, Google Cloud, and Microsoft partnerships from a line item into a growth engine.
At Cornerstone Strategy, we specialize in turning cloud partnerships into growth engines. We work with technology companies to build tailored partnership strategies with AWS, Google Cloud, and Microsoft that deliver real business outcomes — faster time to value, more customers, and accelerated revenue growth
Our Vision
At Cornerstone Strategy, we believe partnering is both an Art and a Science — and where we truly excel is in the Art. The intuition, creativity, and human connections that turn strategic partnerships into revenue-generating, market-moving relationships.
The art is reflected in four partnership pillars that guide everything we do for our clients.
- Stand Out and Win Customer Mindshare
- Lead with Business Outcomes, Not Features
- Execute Go-To-Market Motions that Build Pipeline and Accelerate Revenue
- Choose Partners that Accelerate Your Impact
Grab your copy of the Success Playbook below to see exactly how these four pillars work in action.
Cornerstone Strategy is Eric Rosenstein
For 25 years, Eric has operated at the forefront of Partnerships, Alliances, and GTM Strategy — building relationships and revenue with some of the most influential names in technology, including AWS, Microsoft, Google and Salesforce. His edge isn't just experience — it's an instinctive understanding of what it takes to make partnerships work in the real world.
That instinct was on full display during his tenure with the AWS Public Sector team, where he helped architect a partner community so strategically aligned that it scaled revenue from $15M to $350M over five years. The formula? Partners with the capacity, capability, and commitment to deliver — and a GTM strategy built to win.
Eric now channels that expertise into Cornerstone Strategy, helping technology partners stand out, lead with outcomes, and build the right ecosystem to accelerate growth. He also serves on the Advisory Board of an AI SaaS startup targeting Public Sector customers with an innovative solution that transforms a company's existing content into compliant, citation-backed proposal drafts.
A lifelong learner and dedicated mentor, Eric gives back through the Penn State Smeal School of Business, Georgetown's MBA program, and the Leadership Institute's summer high school internship program — because great partnerships, like great leaders, don't happen by accident.
Eric holds a Bachelor's Degree in Business from Penn State and an MBA in Global Business Strategy, with honors, from Georgetown University.