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With over 138 years of experience, H&H is a trusted full-service infrastructure engineering firm. Our clients, including infrastructure owners, contractors, and colleagues, rely on us for intricate and innovative engineering solutions. They trust our time-tested ability to manage the entire life cycle of a project, from the study and planning phase through to design and construction. With over 600 talented employees located across 32 offices nationwide, H&H can efficiently and effectively handle assignments of all sizes, types, and delivery methods around the country and across the globe.

H&H Questions

The H&H annual revenue was $27.5 million in 2026.

Keith Griesing is the Chief Technical Officer and Principal of H&H.

488 people are employed at H&H.

H&H is based in New York, New York.

The NAICS codes for H&H are [541, 54133, 5413, 54].

The SIC codes for H&H are [87, 871].

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