In 1997 Christie and Greg Wirsen began a consultancy based on environmental services. Since that time we've grown to 16 individuals with diverse backgrounds. Please take a moment to meet our staff and browse their resumes. Please make sure you have the latest version of Adobe Acrobat to avoid any errors.
Christie Lee Wirsen
Mrs. Wirsen is the majority owner of GSE and serves as its Chief Executive Officer. Mrs. Wirsen is in charge of the overall business that GSE engages in, and manages contract oversight, corporate accounting, and corporate policy. Her business and company operational experience guides GSE’s corporate decisions and direction.
Gregory C. Wirsen. MSc
Mr. Wirsen brings 15 years of hazardous waste, health and safety, due diligence, and solid waste experience to GSE. Mr. Wirsen has managed or participated in environmental projects throughout the United States, as well as England and Belgium. Mr. Wirsen also serves as the New England Director of the Construction Materials Recycling Association.
Gary D. James, PE
Mr. James is a registered professional engineer in all New England States (ME, NH, VT, MA, RI, and CT). With over 30 years of experience in the civil/environmental engineering and solid waste industries, and as a former Army Corp engineer, Mr. James brings a solid engineering capability to GSE.
Terry F. Bauer, PG
Mr. Bauer is a Professional Geologist who brings over 23 years of experience with hazardous waste, health and safety, due diligence, solid waste, and civil/environmental engineering projects to GSE. He has managed or participated in local, state and federal regulated environmental projects across the United States and has participated in or managed environmental projects in South America, England, Australia, and Poland.
John S. Blaisdell VP
Mr. Blaisdell is a principal and partner at GSE and has been with the firm since 2001. Mr. Blaisdell has over 12 years of experience with project management in the general civil/environmental and recycling/solid waste management fields. Mr. Blaisdell oversees GSE’s federal services program involving civil and environmental construction and remediation services. Additionally, Mr. Blaisdell specializes in private and public sector solid waste projects, and has extensive experience with solid waste facility permitting, start-up and financing, operations, compliance, and growth. Mr. Blaisdell and has assisted in the establishment or expansion of over 50 recycling/solid waste entities.
Peter R. Flood
Mr. Flood is a project manager with a Bachelor’s degree in Biology, and brings over 6 years of experience with all facets of Environmental Site Assessments including inspections, report preparation, and field sampling and measurement. Mr. Flood also performs solid waste facility compliance inspections, health and safety training and botany associated with Wetland Protection Act filings. Mr. Flood serves as GSE’s lead wetland biologist and was formally an ornithologist for Mass Audubon’s Wellfleet Bay Wildlife Sanctuary.
Eric R. Wirtanen
Mr. Wirtanen is an environmental scientist with a strong background in the geosciences and GIS. Mr. Wirtanen’s experience includes Wetland Protection Act permit applications, all facets of Environmental Site Assessments, field sampling, measurements, and documentation as required of an Environmental Scientist. Mr. Wirtanen also performs solid waste facility compliance inspections, sampling, and asbestos inspections.
T. Lawrence Hineline, LSP
Mr. Hineline is a licensed Site Professional with a Master’s degree in geology and 28 years of experience with hydrogeologic investigations related to hazardous waste sites, solid waste facilities, and petroleum spill sites as well as water supply development and groundwater resource protection. Additionally, he has experience with environmental site assessments, regulatory affairs, and permitting. He has experience with private sector, municipal and federal agency (Navy and Air Force) projects.
Garrett Keegan, PE
Mr. Keegan is a Professional Engineer with 32 years experience conducting, supervising, and managing environmental and civil engineering projects. Mr. Keegan’s work experience includes the design and construction of multiple industrial and domestic wastewater treatment systems. In addition, Mr. Keegan served as the lead engineer and project manager for the design and construction of secure landfills, and the design of bulk petroleum and hazardous materials storage facilities. Mr. Keegan was the lead technical engineer conducting multiple groundwater investigations, ground water modeling, and water quality evaluations/water treatment designs for a public water supply.
James A. Luker, Jr., LSP
Mr. Luker is a Licensed Site Professional with a Master’s degree in geology and brings over 25 years of consulting experience involving investigations, site characterization and remedial actions on a variety of environmental engineering projects. Mr. Luker has extensive experience in working with municipal officials, regulatory personnel and citizens groups. In addition, Mr. Luker has conducted detailed subsurface investigations, remedial investigations, and feasibility studies on sites where groundwater contamination threatens private and or/public water supply systems. Also, he has experience with government sector and federal agency (US Coast Guard and US EPA) projects.
George W. Petersen, Jr., PE
Mr. Petersen is a professional engineer with a Master’s degree in civil/environmental engineering and over 25 years of engineering and construction experience. He has worked on a wide variety of civil engineering projects, general construction, environmental investigations, feasibility studies, and remedial action projects. Mr. Petersen served as the technical lead and supervisor of projects in the New England states and the states of Florida, New York and Nevada. Additionally, Mr. Petersen has experience with storm water regulations, facility plan development and compliance, and federal agency (Air National Guard, US Army Corps, Department of Energy) projects.
