Malvern, PA, January 20, 2026 – Greencastle Consulting, announced the appointment of Eric Diamond as CEO of Greencastle Consulting and Adam Holstein as President of Greencastle Consulting. 

Joe Crandall, Chairman of the Board for Greencastle Consulting, expressed his excitement for this transition stating, “Eric and Adam share a deep commitment to the Greencastle team and our clients. This is a natural next step, and Greencastle Consulting is better for it.”  

Eric and Adam bring a combined 21+ years of experience at Greencastle Consulting. They have served at all levels of leadership and are committed to expanding and enhancing client relationships.  

Eric expressed his goals for his new position sharing, “We exist to prove that no mission is impossible when entrusted to a team of veterans.  Our team’s goal is to make ‘veteran’ the most respected moniker in the corporate world.”

Under their guidance, Greencastle will continue to grow its reputation as the nation’s leading strategy execution firm. 

“After 10 years with Greencastle, I’m incredibly grateful for our team and clients, who have made the journey so rewarding,” said Adam. “Our strength has always been our people, and I’m proud to work alongside such a talented group of veterans.” 

 We look forward to continued growth under this new leadership team.

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Greencastle Associates Consulting is a 100% veteran-owned and operated strategy execution firm. We exist to empower organizations with innovative solutions that drive unparalleled success. As the nation’s premier strategy execution firm and 100% veteran-owned and veteran-operated consultancy, our commitment is to deliver expertise rooted in experience, customized solutions that uniquely fit each client, and an unwavering dedication to high-quality results.