With more than 139 years of experience, H&H is a trusted, full-service infrastructure engineering firm recognized for solving complex challenges that matter. We partner with infrastructure owners, contractors, and collaborators to deliver innovative, forward-looking engineering solutions that support long-term performance and resilience. From planning and design through construction, our teams manage every phase of the project life cycle with a focus on quality, value, and lasting impact.

Our Downtown Philadelphia office continues to grow as part of H&H’s strategic expansion across the Northeast. The team delivers high-quality engineering services for clients, including SEPTA, Amtrak, NJ TRANSIT, NJDOT, and municipalities throughout the region, combining local insight with the strength of a national firm.

Across Philadelphia office and the broader organization, H&H engineers are known for technical excellence and collaboration. With deep experience across diverse structure types, our teams understand the critical interactions between structural, mechanical, electrical, civil, rail and geotechnical systems, enabling practical and innovative solutions designed for long-term success.

H&H’s mission is to deliver outstanding engineering solutions that improve infrastructure, create value for our clients, and enhance the lives of the communities we serve.

H&H proudly supports WTS across the firm and through active sponsorship and engagement with the Philadelphia Chapter.

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