Meet Our Experts…


Lee J. Beetschen, P.E., DEE, Principal

Mr. Beetschen is a Principal of CABE Associates, A Duffield Associates Company. He is regarded as one of the region’s most forward-thinking environmentalists and engineers, with an unusual capability to spot the emergence and evolution of issues and to address them with creative solutions.  He conceived the following wastewater system firsts on the Delmarva Peninsula: Rapid infiltration basin, redirection gallery, deep injection well, hydrograph release NPDES permit, watershed trade, artificial wetlands treatment, and overland flow.  Additionally, Mr. Beetschen is a member of the state of Delaware’s Clean Water Advisory Council and the Council on Transportation, and was also recognized for his innovative thinking by receiving the Leonard Glass aware from the Chesapeake Water Environment Federation.





Scott C. Hoffman, P.E., Project Manager

Mr. Hoffman’s primary responsibilities include all phases of project management of large scale water and wastewater projects for both municipal and industrial clients.  His experience with water projects includes potable water treatment plants, both iron and arsenic removal, and distribution systems.  His municipal wastewater project experience with New Castle County includes sequential batch and membrane reactors as well as conventional activated sludge.  Much of his extensive industrial wastewater treatment experience is for poultry industry upgrades and expansions for spray irrigation disposal systems.  Mr. Hoffman also has singular skills for the use of GIS as a tool for data collection, planning, and preliminary engineering.





Steven H. Lewandowski, P.E., Project Manager

Mr. Lewandowski has specialized in providing guidance and service to private utility and local government clients.  Currently, Steve is responsible for all phases of project management for potable water and wastewater facilities projects from project conception to completion.  Mr. Lewandowski has managed the design and construction of potable water facilities projects for Tidewater Utilities, including production/treatment plants, storage tanks, and distribution systems funded through the Drinking Water State Revolving Fund.





Brian Lyncha, P.E., Project Manager

Mr. Lyncha has 24 years of experience and is a Senior Engineer.  Mr. Lyncha is a regulatory specialist for many federal, state and local environmental programs.  He has authored over 250 SPCC plans, environmental site assessments, storm water pollution prevention plans, hazardous waste management plans, accidental release prevention plans, risk management plans, underground storage tank closure plans, hydrogeologic investigations, and other related documents.  Mr. Lyncha has prepared and implemented spill response and emergency response programs for a wide range of governmental, industrial and municipal clients. He also provides consulting and compliance assistance with air permitting programs, community right-to-know (Tier II), toxic release inventory (TRI), waste minimization assessments, environmental audits, and hazardous material cleanup.




Alejandro Villanueva Jersey style=”margin-left: 15px; margin-right: 15px;” src=”×300.jpg” alt=”bross 2010 cropped” width=”160″ height=”200″ />Jeffrey M. Bross, P.E., LEED AP, F. ACEC, Chairman, Senior Consultant of Duffield Associates

Mr. Bross has consulting and project management responsibility for civil engineering, coastal engineering, water resources, environmental, hazardous waste, and regulatory agency projects.  He has extensive experience in the preparation and attainment of permits and the development of requisite mitigation associated with permitting for difficult and challenging projects.  Mr. Bross has been a principal regulatory negotiator and has a strong working relationship with local, state, and federal regulatory agencies throughout the Mid-Atlantic region.  He was instrumental in drafting the revision of the Unified Development Code (UDC) of New Castle County on behalf of the Consulting Engineers Council of Delaware, Committee of 100, and the New Castle County Chamber of Commerce.  He has authored numerous technical articles and papers, and is a featured speaker on issues involving environmental and construction matters.



Alejandro Villanueva Authentic Jersey 15px;” src=”×300.jpg” alt=”Marcozzi 08 cropped” width=”160″ height=”200″ />Guy Marcozzi, P.E., President / CEO of Duffield Associates

Mr. Marcozzi has over 25 years of diverse experience in performing and managing civil, geotechnical and structural engineering. His experience includes geotechnical and structural evaluations and design, land development, transportation and sustainable design with emphasis on effective and incorporation of existing site features into the project and sustainable development.   Mr. Marcozzi’s knowledge of civil engineering, structural engineering, the geosciences and real life construction results in innovative, pragmatic and cradle to grave solutions, which provide unique value to our clients.




Charles 05 croppedR. David Charles, P.E., Executive Vice President of Duffield Associates

Mr. Charles is the Executive Vice President of Duffield Associates and Senior Consultant for geotechnical and construction-related projects.  In addition to his administrative responsibilities, he serves as a Senior Geotechnical Engineer and Consultant for geotechnical site evaluation, instrumentation, analysis, and evaluation of subsurface conditions for foundations, structures, and pavements.  Mr. Charles specializes in deep foundations, soft soils solutions, and geotechnical instrumentation.  He has extensive experience in earth embankment design, analysis and construction.





smith deirdre 06 croppedDeirdre S. Smith, P.E., Senior Project Manager & Professional Services Division Director of Duffield Associates

With over 24 years of experience in civil, water resources and geotechnical engineering, Ms. Smith is responsible for management and oversight of the firm’s civil and site engineering, environmental, hydrogeologic, water resources and natural resources professional staff and projects.  She has also coordinated field review, analysis and report preparation for geotechnical subsurface evaluations, performed and served as the senior reviewer on slope stability analysis geotechnical and civil engineering projects including dikes, embankments and landfills, as well as the installation, field monitoring, data reduction and interpretation, and report preparation for geotechnical instrumentation projects.




Cloonan 04 croppedJames F. Cloonan, P.E., Senior Consultant at Duffield Associates

Mr. Cloonan has been with Duffield Associates for over 28 years and his responsibilities include coordinating the activities of geotechnical and foundations engineering personnel, contract development, and client interface. As a Senior Consultant, Mr. Cloonan was previously responsible for coordination of the company’s design build projects, contract development, and client interface.  Project Manager responsibilities include all phases of site development, construction management, subsurface soil condition analysis, report preparation, and construction review for the purpose of foundation, pavement and earthwork design and construction, and materials testing.




Stack 01 croppedW. Hank Stack, P.E., Geotechnical and Field Services Division Director of Duffield Associates

Mr. Stack’s responsibilities as the Geotechnical and Field Services Division Director include overseeing all field and laboratory operation Alejandro Villanueva Womens Jersey for the firms multiple offices, including two AASHTO laboratories one of which is authorized to perform testing for the USACE. His responsibilities include management of field drilling programs, geotechnical analysis and preparation of geotechnical evaluation reports, construction consulting for optimizing best practices to add value to client’s needs.  He has served as Project Manager for the firm’s larger sampling, instrumentation, earthwork, concrete, steel, and pavement construction projects.  His experience includes field review of pile, micro pile and caisson installations; geotechnical instrumentation; structural steel review, concrete, masonry, earthwork and sediment and erosion control measures using best management practices.



Beringer 99 croppedM. Richard Beringer, P.E., LEED AP, REP, Environmental Senior Consultant of Duffield Associates

Mr. Beringer has thirty years of environmental experience. He is responsible for project management, planning, and technical issues for environmental engineering and science projects. Project experience includes: project planning and permitting assistance; Phase I, and II Environmental Assessments; hydrogeologic investigations, sediment and water quality assessments, remedial investigations, water/wastewater studies, NPDES compliance, environmental impact statements (EIS), state and federal Superfund Sites site evaluation and remediation; emergency response actions; industrial waste landfill design, flood modeling and flood hazard reduction planning; and Brownfield Program Sites.




Jenkins 05 croppedW. Andrews Jenkins, P.G., LEED BD+C, Senior Environmental Project Manager/Senior Geologist of Duffield Associates

Mr. Jenkins has over twenty five years of environmental experience and is a Senior Project Manager in our firm on the environmental services team. Mr. Jenkins performs property evaluations where adverse environmental impacts may have occurred to soil, sediment, surface water, groundwater, or buildings. These projects include historical research, field sampling, analysis, interpretation, attention to industry standards and regulatory requirements, and communications with clients and regulatory agencies.




Whallon-croppedChristopher C. Whallon, Esq., P.G., Environmental Section Manager of Duffield Associates

Mr. Whallon has over 30 years of diverse environmental experience as an attorney, consultant, and contractor working with both public sector and private clients. His technical experience includes: design, performance and evaluation of multi-disciplinary redevelopment projects; site assessments and characterizations; remedial design and oversight; permitting; compliance evaluation and environmental auditing; and emergency response. His environmental management experience includes positions as a line, section and practice group manager (environmental consulting), department manager (environmental contracting), program management for multi-project initiatives, and project manager. His legal environmental experience includes representing clients in litigation and regulatory matters arising under both federal and state law, property transfer matters, and evaluation and counseling regarding environmental risk.




WaltersD. Dwight Walters, P.E., Civil Engineering Section Manager of Duffield Associates

Mr. Walters has over 26 years of experience in design and project management of civil engineering related projects – including civil-site design, municipal engineering, surveying, water resources and water/wastewater practices. He has been leading and managing engineering departments and offices since 1997. These duties included overall supervision of the following departments: Urban Planning & Development, Municipal Engineering, Surveying, Environmental Planning, Environmental Engineering and Construction Inspection. Mr. Walters has managed commercial, industrial and residential projects both in the public and private sector.




devine-croppedBrian J. Devine, P.E., Field Services Section Manager of Duffield Associates

Mr. Devine serves as a manager in the Field Services Division where he manages multidisciplinary projects including: geotechnical design/analysis/reporting and construction review. His geotechnical responsibilities include design and review of field drilling programs, soil and rock core sampling and logging, geotechnical analysis (bearing capacity and settlement, pile analysis), design of ground improvement programs, design of earth retention systems, preparation of geotechnical evaluation reports, and slope stability analyses. His experience also includes the design of articulating concrete block revetment systems, temporary shoring systems and mechanically stabilized earth structures and slopes.




jakubowski-croppedJoseph Jakubowski, P.E., LEED AP, Geotechnical Section Manager of Duffield Associates

Mr. Jakubowski serves as a geotechnical section manager with 13 years of experience with in situ testing, logging, and instrumentation installation such as Standard Penetration Test borings, cone-penetrometer borings, rock coring, piezometers, groundwater monitoring wells, and inclinometers; groundwater sampling; shallow foundation analysis; deep foundation analysis; waterfront constructions; pavements; sheet pile structures; site investigations and geotechnical explorations; geo-environmental studies; report writing; project management and budgeting; and the LEED green building certification system. Mr. Jakubowski was chosen as the 2014 Young Engineer of the Year by the Delaware Engineering Society.



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 Jennifer L. Gresh, P.G., Philadelphia Services Leader of Duffield Associates

Ms. Gresh has 14 years of experience assessing environmental impact to land, air, and water.  In her capacity as the Philadelphia Services Leader and an Environmental Project Manager, Ms. Gresh oversees Phase I and II Environmental Site Assessments, remedial investigation/feasibility studies, Brownfield Investigations, remedial design, health and safety plans, operation and maintenance plans, spill prevention and countermeasure control plans, stormwater plans, aboveground and underground storage tank removals and assessments, and environmental remediation/cleanup projects.

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