Gregory Sies

Greg Sies serves as a key procurement professional within the W072 Endist Pittsburgh office of the U.S. Army Corps of Engineers, supporting the Department of the Army’s mission to sustain and modernize critical civil infrastructure. He manages acquisitions for heavy civil engineering projects including dam and levee rehabilitation, lock system upgrades, and water resource facility modernization. His portfolio encompasses construction, site preparation, and engineering services essential to flood control, navigation, and environmental resilience. Sies ensures compliance with federal acquisition regulations while aligning procurements with strategic infrastructure priorities across the region. His primary contractor relationships center on established heavy civil construction firms such as MCKENZIE CONSTRUCTION & SITE DEVELOPMENT LLC and C. J. MAHAN CONSTRUCTION COMPANY, LLC, with whom he maintains long-term, performance-based partnerships. These vendors are frequently engaged for complex, multi-year projects requiring specialized expertise in earthwork, hydraulic structures, and erosion control. Sies prioritizes contractors with proven track records in federal infrastructure delivery, fostering collaborative relationships that emphasize safety, schedule adherence, and quality assurance. Sies demonstrates a strong commitment to small business participation, with nearly half of his acquisitions structured as total small business set-asides under FAR 19.5. He consistently leverages Service-Disabled Veteran-Owned Small Business (SDVOSB) and HUBZone set-asides to promote socioeconomic equity, reflecting the agency’s dedication to inclusive contracting. His pattern of awarding contracts to small, specialized firms aligns with broader Army goals to strengthen local economic resilience while ensuring technical capability. His procurement focus is concentrated in NAICS 237990 (Other Heavy and Civil Engineering Construction), complemented by engineering services (541330), site preparation (238910), and landscaping (561730). He routinely acquires technical services for hydrologic modeling, geotechnical analysis, and construction management, underscoring his expertise in water resources infrastructure and public works engineering.