(973) 808-9050
12A Maple Ave, Pine Brook, NJ 07058

About Us

SESI Consulting Engineers provides value-driven engineering for owners, developers, and the construction industry. Through execution of a comprehensive, coordinated approach, SESI manages projects from concept through completion. Our staff of licensed Professional Engineers and LSRPs maintains close, continual contact with clients while utilizing project-specific, construction-focused techniques to provide functional and economical solutions.

Established in 1976, SESI has earned an excellent reputation for providing comprehensive Geotechnical, Environmental, and Land Development Civil engineering services. Headquartered in Pine Brook, New Jersey, SESI serves residential, commercial, industrial, manufacturing, and chemical companies, developers, and government agencies throughout the Northeastern United States.


SESI’s mission is to advance the success of our clients by approaching every project as a partnership. We aim to encourage a culture that values solutions, excellence, service, and integrity. 


Anthony Castillo, PE

Tony Castillo - webTony joined SESI in 2002 and brings extensive design experience from his work with Schoor DePalma, Inc., Andrew Marshall Consulting Engineers and Thonet Associates, Inc. During his tenure with these firms, he provided engineering design services for numerous site plan and subdivision projects including all aspects of layout, grading and drainage. Tony also provided environmental design solutions for land use planning and water resources projects including hydraulic and hydrologic modeling, flood insurance and floodplain studies, dam design and rehabilitation projects and environmental permitting.

While at SESI, Tony has developed a multi-discipline design and drafting staff. He is responsible for the production and coordination of site planning projects including commercial developments, townhouse developments, office buildings and warehouse facilities. Tony is also responsible for the production and coordination of water resource projects such as Dam Hazard Classification Analysis. He is particularly experienced at project coordination and permitting involving multiple review agencies.

Tony has both a Bachelor of Science degree in Civil Engineering & Master of Science degree in Civil Engineering from the New Jersey Institute of Technology. He is a Licensed Professional Engineer in NJ, NY & MD.

Fuad Dahan, PE

Fuad Dahan - webDr. Fuad Dahan joined SESI in 2013 as a Senior Project Engineer. He brought over 15 years of environmental engineering expertise and diverse experience including environmental treatment system applications, design, research and monitoring. He has worked on federal, state, and private projects. He managed multi-million dollar projects and programs for large corporations including Fortune 500 companies.

While at SESI, Dr. Dahan has managed several New York Brownfield Clean-up projects from initial site characterization through obtaining a Certificate of Completion (COC). He also managed New Jersey brownfield and landfill development projects.

Prior to joining SESI, Dr. Dahan worked at Leidos (previously SAIC) where he was the company lead in green remediation. He was the lead environmental engineer on federal and private superfund sites, which included implementation of several in-situ remediation technologies. He also managed a $5 million program to treat industrial wastewater at federal facilities.

Prior to SAIC, Dr. Dahan worked at URS Corp on the multiphase implementation of remedial action for a $9 million project, that included investigation, SVE, and ex-situ treatment technologies.

Dr. Dahan received his Bachelor’s degree from American University of Beirut, his Masters in Chemical Engineering from Drexel University and his Ph.D. in Environmental Engineering from Purdue University. He is a Licensed Professional Engineer in New Jersey and New York, as well as a Licensed Site Remediation Professional in New Jersey. 

John M. Nederfield, PE

John M. Nederfield - webJohn joined SESI in 1998. He has been involved in sitework and foundation inspection on projects including single family residential, office buildings, retaining walls, shopping centers, residential towers, and warehouses. One project that John was involved in covered an entire block in White Plains, New York. The project included two multi story residential towers, a multi-level parking garage, a multi-story shopping mall, and a multi-story office building.

John has been involved in conducting numerous Geotechnical Site Investigations and compiling Geotechnical Reports that provide recommendations for site preparation procedures, foundation design criteria and pavement design.

John has been involved in managing field work in all phases of sitework and foundation construction. He is also certified for using a nuclear moisture density gauge.

John received his Bachelor’s degree in Civil Engineering from Drexel University. He is a Professional Engineer in NJ, NY and PA.

Michael St. Pierre, PE

Michael St. Pierre - webMichael is Principal-in-Charge of the firm’s Geotechnical Services Group and is also heavily involved in New York State Environmental projects. He has been involved in all phases of geotechnical, environmental, civil engineering design and cost estimating for residential subdivisions, low to high-rise multi-family residential buildings, office buildings, shopping centers, warehouses, parks/recreation facilities, and athletic fields for over 25 years.

Michael has designed, managed and inspected fieldwork for all phases of site work and foundation construction including dynamic compaction, piles, Controlled Modulus Columns, pre-construction surveys, shallow foundations, compacted fills, pavement construction, retaining walls, artificial treatment of soils, controlled blasting, support of excavation, underpinning, environmental cleanups, monitoring of settlement points and surveying. He has extensive experience in surface and subsurface soil and groundwater investigations for site preparation, foundation design criteria, pavement design, settlement analysis, foundation challenges and slope failures.

Michael is heavily involved in the project from initial client contact and project inception through project completion. He is a practical engineer who uses his experience to keep projects on schedule and within budget. He often provides alternative cost-saving techniques to make projects economically viable, including dynamic compaction of industrial landfills and miscellaneous uncontrolled fills, treatment of unsuitable soils, compacted fills using available non-select materials and surcharging.

Michael has both a Bachelor of Science degree in Civil Engineering & Master of Science degree in Civil Engineering from the New Jersey Institute of Technology. He is a Licensed Professional Engineer in NJ, NY, PA, and MA.  Michael also serves as the Firm’s President and Managing Director. 

Justin Protasiewicz, PE

Justin Protasiewicz - webJustin has been with SESI since 2008. He has coordinated and performed geotechnical and environmental subsurface investigations, prepared geotechnical reports with foundation and site preparation recommendations, assisted in various geotechnical, environmental, and water resource designs, and provided construction inspection for a wide range of projects from residential developments to office/warehouse buildings. Geotechnical investigations consist of overseeing test pits, boreholes and permeability testing. Environmental investigations range from assessing sites and sampling sediment, water and/or soil to determine what potential impacts this may have on human health and the surrounding environment to researching a properties history to determine what contaminants may be present onsite. He has inspected a wide range of construction work including underpinning, slope stabilization, footing subgrades, compacted fills, concrete, pavements, piles, retaining walls, dynamic compaction, slab subgrades, piezometers and interaction with other inspection agencies. Environmental investigations and inspection work involved monitoring well installations, groundwater and soil sampling, air monitoring and adhering to remedial action plans for specific sites.

Justin received his Bachelor’s degree from Farleigh Dickinson University. He is an engineer in NJ and NY.

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