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Meet our team

Chief Executive Officer Christian D. Green


As founder and CEO, Mr. Green oversees strategic planning, business development, and client services development. Mr. Green’s commitment to client service has played a major role in his approach to managing the firm and developing environmental service products to cost effectively meet client and market needs. Mr. Green has 24 years of environmental compliance, assessment, investigation, and remediation experience, and 38 years of technical business management expertise. Collectively, Mr. Green’s environmental and business backgrounds have allowed him to develop and grow a successful environmental and engineering consulting firm in a challenging and dynamic business climate.

President Jonathan C. Green


Mr. Green has experience in air quality management, soil vapor & groundwater monitoring, and environmental site assessments. He has performed hundreds of ESAs ranging from the simple to the complex. The commercial industries for which Mr. Green has provided due diligence expertise include aerospace, chemical, dry cleaners, trucking, gasoline bulk plants, manufacturing, insurance, real estate, farms, property management, and more.

The types of ESAs that Mr. Green has performed include Database Reviews, Transaction Screen Assessments, and Phase I investigations and due diligence in support of real estate transactions, and investigations of surface and subsurface soil, groundwater, surface water and sediment impacted by a variety of chemical and radiological contaminants. His interactions with local, state, and federal regulatory agencies are aimed at ending the environmental “study cycle,” securing site closure, and capping clients’ ongoing costs and liabilities.

Senior Geologist Carrie A. Beveridge


Carrie A. Beveridge has been practicing environmental and engineering geology throughout Oregon, Washington and Texas for a variety of Public and Private Sector clients for over fifteen years. Ms. Beveridge has successfully completed several hundred Phase I Environmental Site Assessments. Subject properties include industrial food processers, timber and log yards, landfills, golf courses, morgues, commercial aircraft manufacturing and maintenance facilities, industrial manufacturing plants, industrial commercial complexes, retail complexes, historical urban properties, medical and dental facilities, hospitals, large scale commercial timber assets, dry cleaners, auto repair facilities, clandestine drug labs, and commercial farms. Ms. Beveridge developed a modified Phase I ESA template for the purpose of assessing large industrial sites, including full capacity crude oil refineries in Texas and Delaware.

Ms. Beveridge has managed a wide range of Phase II and Phase III Environmental Site Assessments (ESAs) including Geological Hazards and Environmental Risk Assessments, Beneficial Water Use Studies, Emergency Spill Response, and Environmental Geophysical Surveys, and has brought several environmental remediation projects to regulatory closure. Ms. Beveridge additionally has extensive experience managing and implementing vapor intrusion and indoor air assessments.

Regional Manager Cristina F. Brischler


Cristina Brischler has over 20 years in the environmental consulting industry with a variety of clients including private, municipal, public agencies, and federal government. She earned her Bachelor of Science degree from the University of Massachusetts, Amherst in Environmental Sciences with a concentration in Biology.

Ms. Brischler is experienced in conducting Phase I Environmental Site Assessments, Phase II and remediation projects for gasoline stations, dry cleaners, and industrial sites, vapor intrusion assessments, air permitting, stormwater pollution prevention plans, spill control & countermeasure plans, groundwater modeling, hazardous waste characterization and manifesting, and UST closures.

Ms. Brischler will be responsible for managing GӏEӏM’s expanding clientele in Idaho, Montana, Eastern Washington, Wyoming, and North and South Dakota.

Regional Due Diligence Manager Sylvia Downing


Ms. Downing is an Environmental Professional with over 17 years of experience. Ms. Downing has performed hundreds of Transaction Screens, Phase I Environmental Assessments and Regulatory Compliance Assessments involving residential, commercial, and industrial properties throughout California, Alaska, Arizona, Colorado, Hawaii, Nevada, Texas, Utah, and Baja California. In addition to the standard ASTM scope of work, Ms. Downing has completed asbestos, radon, and lead in drinking water sampling operations. Ms. Downing is responsible for project coordination and quality control, project management, and client contact at GӏEӏM.

David Green

David Green - Vice President

Mr. David S. Green is an environmental professional with over 10 years of experience in a variety of environmental site assessment (ESA) projects. He earned his Bachelor of Science degree from Oregon State University in Natural Resources. Mr. Green has performed hundreds of Database Reviews, Transaction Screens, and Phase I Environmental Assessments involving residential, commercial, and industrial properties throughout the northwest. In addition to the standard ASTM scope of work, Mr. Green is also an accredited AHERA Asbestos Inspector.