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TORRANCE, CA (July 8, 2025) — Partner Engineering and Science, Inc. (Partner) is proud to announce the promotion of Jerry Ostrander to National Practice Leader of the firm’s Environmental Solutions Practice. This appointment recognizes Ostrander’s proven leadership, deep understanding of commercial real estate (CRE) dynamics, and steadfast commitment to delivering results without barriers. 

DENVER, CO – Partner Engineering and Science, Inc. is proud to announce the appointment of Brian Carlin, PE, CBCP, CEM, as Director. Mr. Carlin brings a distinguished track record of leadership, technical expertise, and business development success to Partner. 

Matthew Marcus, Managing Director at Partner Engineering and Science Inc., was recently featured as a guest speaker by The Ground Investigation Podcast. He shares his extensive experience in geotechnical engineering, seismic resilience, and project management.

From tariffs to low bids, you’ll learn what’s shaping Construction Risk today in the latest Construction Risk Management newsletter. Also, a must-read, check out the latest 2025 Construction Risk Management Journal, highlighted in this edition.

May 2025—Torrance, CA—Partner Engineering and Science, Inc. (Partner), is pleased to announce that its founder and CEO, Joseph P. Derhake, PE, was selected as a finalist in the 2025 LA Times Studios LA Executive Forum and Leader Awards.

Partner experienced significant growth in 2024 despite challenges in the CRE market, with annual revenue increasing to $334,204 from $279,640 in 2023 (19%). To support this growth and in anticipation of increasing demand, Partner increased its staff from 1,300 employees in 2023 to over 1,400 at present.

CHICAGO, IL – Partner Engineering and Science, Inc. is pleased to welcome Justin Arias to the position of Director based out of Chicago, Illinois l Mr. Arias brings over a decade of leadership experience to this role and a focus on operational management and organizational leadership. 

Members of the National Association of Wetland Managers (NAWM) recently featured Partner’s Katie Morgan, PWS, EP, Director of Natural and Cultural Resources at Partner Engineering and Science, Inc., in its February Member Spotlight. The edition highlights the good work members are doing to protect and restore our wetland resources, how they came to work in wetlands, and how being a member of the Association benefits their work. Katie shares her own experiences, including her time working at Partner. Make sure to visit the post for more information.

Chino, CA – Partner Engineering and Science, Inc. is pleased to announce the appointment of Brandy Groves as Senior Project Manager, serving clients throughout San Bernardino County and surrounding areas.