Philadelphia, PA — Partner Engineering and Science, Inc. one of the nation’s leading environmental due diligence and engineering consulting firms has expanded its Mid‐Atlantic presence with the hiring of Aaron Epstein to head the firm’s newly-opened Philadelphia office.
Epstein, a Professional Geologist registered in Pennsylvania, Delaware, and Virginia brings to Partner a depth of experience in environmental and geotechnical services for federal, municipal, legal and commercial clients, specifically Phase I Environmental Site Assessments, Superfund, RCRA, litigation support for environmental/toxic tort cases, and remediation. Epstein was formerly with the local office Pozo Engineering and Geotech where he consulted with lenders and investors on a wide variety of environmental due diligence matters. Previously, he managed the East Coast operations for AEI Consultants, a San Francisco‐based environmental services firm. Epstein earned his BS from the University of Oregon.
One of the fastest growing private companies in the United States, Partner Engineering and Science, Inc. is a national environmental and engineering consulting firm focusing on real estate due diligence including Phase I and II Environmental Site Assessments, building sciences, construction monitoring, and environmental site remediation services. Since its inception in 2008, the firm has grown to become one of the leading environmental due diligence firms in the nation.
Philadelphia is the firm’s 16th U.S. office and brings further depth to the other regional offices in New Jersey, New York and Maryland, according to President Joseph Derhake, PE.

May 27, 2026
In cities across the country, historic industrial assets continue to present challenges and untapped potential. For developers willing to navigate the complexity – and for advisors equipped to translate that complexity into actionable insight – these properties can become catalysts for long-term urban reinvestment.

May 20, 2026
Corey Myers discusses how proactive indoor air quality programs help commercial property teams prevent mold, moisture, and tenant complaints before they escalate.

May 20, 2026
Frank Krech, Sr. Engineer at Partner, brings years of expertise in structural engineering, building envelope consulting, & restoration engineering.




