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Joseph Derhake, PE

Joseph Derhake, serves as Chief Executive Officer of Partner Engineering and Science, Inc., the industry leader in engineering and environmental due diligence consulting. A successful entrepreneur, Mr. Derhake founded Partner with eight employees and the company has rapidly evolved to over 600 employees nationwide, with recent expansion into the international market. 

Mr. Derhake has fostered a company culture that continues to attract top talent to serve Partner’s clients by providing a values-driven, collaborative and entrepreneurial environment committed to a work-life balance. 

With over 25 years of experience as a professional engineer, Mr. Derhake has delivered consulting services for thousands of real estate transactions, subsurface investigations and site remediation projects for leading national corporations, lenders, and real estate investors.  Through this, Mr. Derhake and Partner have been afforded great access to key policy credit managers with national and regional lenders providing the opportunity to participate in the writing and reviewing of environmental and engineering due diligence policies for over twenty large financial institutions.  In this role, Mr. Derhake combines technical background, business expertise and knowledge of the world of real estate finance. 

Mr. Derhake has also pushed innovations in the due diligence industry.  He has successfully purchased and integrated six companies into the Partner framework, with the 2009 purchase of LandAmerica Assessment Corporations (LAC) and the 2013 purchase of Birdsall Services Group (BSG) being the two largest of these M&A transactions. These large scale staff and systems integrations have catapulted Partner to the top of the provider ranks with access to over 100 design engineers, empowering clients with solutions to their due diligence challenges.  

Mr. Derhake is frequently invited to share his unique experience and perspective of the current state and the future of the CRE world through speaking engagements, webinars, blogs and articles. 


Registered Professional Civil Engineer in nine states: California, Arizona, Alabama, Idaho, Ohio, Tennessee, Texas, New York, Oregon
Contractor’s License: Engineering ASTM Property Condition Assessment Certification


MBA, University of Southern California
BS, Civil Engineering, Michigan State University

EY Entrepreneur of the Year Finalist - 2015Industry Influencer - PRISM 2016