(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 group of licensed Professional Engineers, LSRPs, and support personnel is dedicated to providing our clients and industry colleagues, top-quality service, design, solutions, and respect. We maintain a high standard of achievement and conduct through excellence in the work performed for the public good, while promoting integrity and dependability in our relationships. In association with our clients and colleagues, our goal is to improve the quality of life through engineering excellence.


Steven P. Byszewski, PP, PE

Steve Byszewski - webSteve’s background in site planning and development and his experience in soils investigations, site evaluations, and environmental assessments enable him to bring to both residential and commercial land development projects a creative, workable approach to site planning.


Steve has over 35 years of experience in land use entitlements and environmental matters. In his capacity as Principal-in-Charge of the Land Development Services Group, he manages projects from initial Client contact through permit approvals, as well as managing the Group’s professional and support staff.


Steve has a Bachelor of Science degree in Civil and Environmental Engineering from Clarkson College. He is a Licensed Professional Engineer in NJ, NY, PA, CT, and MD, and a Licensed Professional Planner in NJ. Steve also serves as the Firm’s President and Managing Director.

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.


Kenneth Quazza, PE

Ken joined SESI in 1979, bringing his knowledge of construction techniques and procedures acquired through his experience in the construction industry. This knowledge, combined with his specialized studies in soil behavior, permits him to play an instrumental role in the installation of special construction items. Projects have included the underpinning of multi-storied structures and the installation of soil and rock anchors, as well as bracing systems for deep excavations.
Ken Quazza - webAs Principal-in-Charge of the Geo-Structural Services Group, Ken has overseen numerous subsurface investigations and site feasibility studies throughout the tri-state area. While with SESI, he has gained experience and expertise in structural analysis and design. Ken has designed bracing systems using a wide variety of engineered materials and has been involved with the design of retaining walls using modular block systems, gabions, reinforced concrete and hybrid wall systems. He is particularly skilled in assessing and correcting damage done to existing structures resulting from foundation movements. Most recently, Ken has been involved with the stabilization of steep slopes in both soil and rock. The methods of stabilization have included installation of protective netting, installation of permanent rock bolts, both active and passive, and the application of shot-crete. Retaining walls constructed as drilled piers with soldier beams have been designed and constructed under Ken’s observation to stabilize steep slopes above rock cuts.
Ken 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, and CT.

Christopher F. Zwingle, PE, LSRP

Chris Zwingle - webChristopher has over thirty-five years of engineering experience encompassing geotechnical engineering, the redevelopment of contaminated sites, remediation engineering, and landfill engineering.  Chris joined SESI Consulting Engineers as a Principal in 2005 and has since been the Principal in charge of the Environmental Services Group.  While at SESI, Chris has managed several large brownfield engineering projects in NJ, acting as both the geotechnical and environmental engineer-of-record.  He has also managed many geotechnical engineering projects involving ground improvement, and shallow and deep foundations.
Prior to SESI he served as the Engineering Director for TRC Solutions, Millburn, NJ.  Chris managed the redevelopment and the remediation of contaminated sites, including landfills.  While at TRC, Chris’ responsibilities included management of engineering projects, personnel, and budgets. Chris was the firm’s account manager for ExxonMobil Corporation and performed investigations and the remediation of several areas of the Bayway Refinery, Linden, NJ.
Prior to TRC, Chris was a senior engineer with Exxon Research and Engineering, Florham Park, NJ.  As an in-house technical expert, he consulted to Exxon affiliates world-wide on environmental engineering projects.  Chris was instrumental in managing remedial investigations and designs at the Bayway Refinery, Linden, NJ, and the Bayonne NJ Terminal.  Chris is an expert in the recovery and remediation of oil contaminated soil and groundwater.

Chris has a BS degree in Geology from Farleigh Dickinson University, and both BS and MS degrees in Civil Engineering from New Jersey Institute of Technology, Newark, NJ.  He is a Licensed Professional Engineer in NJ & NY, and a Licensed Site Remediation Professional (LSRP) in the state of New Jersey.

Roger Hendrickson

Roger Hendrickson - webRoger joined SESI in 1981, bringing years of design experience with firms such as A.J. O’Sullivan, A.I.A. and Paulus, Sokolowski & Sartor. During his tenure with these firms, he participated in the design of Montclair State NCAA athletic fields, Greystone Psychiatric Hospital Rehabilitation Center, and Golden Nugget Casino and Parking Garage. He was also responsible for the Natural Resource Inventory of the Jefferson Township (N.J.) Master Plan.
Since joining SESI, Roger has managed a multi-discipline design and drafting staff.  He has been responsible for the production and coordination of subdivisions and site planning projects including townhouse developments, residential subdivisions, major shopping centers, and office buildings throughout the metropolitan area. His experience also includes geotechnical fieldwork, soils analysis, construction inspections.
Roger’s experience in site planning and development, combined with his knowledge of construction techniques, allows him to approach a design problem with a thorough understanding of a developer’s need. He is particularly experienced at project coordination while organizing the input of engineers, surveyors, contractors, and clients to bring projects through regulatory and agency approvals. Roger has earned respect both from contractors and developers for his innovative design techniques. He is committed to the idea of value engineering, a concept that requires that insight and imagination be used to find workable design and engineering alternates that will result in cost efficiencies for both contractor and owner.
Roger has a Bachelor of Science degree in Natural Resources from Ball State University

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.

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