Greencastle Consulting
Business Consulting and ServicesPennsylvania, United States51-200 Employees
Greencastle Consulting is a mid-sized firm in the business consulting and services sector, based in Malvern, Pennsylvania. Founded in 1997 by veterans, it remains 100% veteran-owned and operated. The company focuses on strategy execution, operations consulting, and data analytics, offering tailored solutions to address specific challenges and support durable improvements across the organization. Its work emphasizes cross-functional collaboration and a holistic view of culture, goals, and unique constraints to uncover opportunities and drive measurable results. The firm has earned recognition such as placement on the Inc. 5000 list and awards recognizing its veteran-owned status and workplace excellence. In January 2026, leadership changes named Eric Diamond as CEO and Adam Holstein as President.