Architectural History

ASM Affiliates is a 100% employee-owned Cultural Resources Management firm established in San Diego County in 1977. With offices throughout the western and Pacific U.S., it provides archaeology, historic preservation, architectural history, GIS and drone services, and other specialized services to help clients meet federal, state and local compliance requirements.

ArchaeologyCuration and Storagedrone servicesGISGround Penetrating Radarhistoric preservationlaboratory analysisPhotogrammetryPublic InterpretationRock Art AnalysisUnderwater archaeologyX-ray fluorescence

Clifton Historic Resources, LLC is a Woman-Owned Business Enterprise (WBE) certified architectural history and cultural resource management consulting firm based in Tennessee. Founded in January 2022 by Angie Clifton Thiel, M.A., it provides Section 106 reviews and NEPA-related historical assessments for engineering and telecommunications projects, historic surveys and inventories, historic contexts, and NRHP nominations. Clients include civil engineering firms, consultants, municipalities, and federal and state government agencies.

architectural surveysarchival researchcultural resource managementNational Register nominationsNEPA-related historical assessmentsSection 106 reviewstraining and policy development

Environmental Corporation of America (ECA) is an employee-owned environmental, ecological, geotechnical, and cultural resources consulting firm founded in 1989, serving public and private sector clients throughout the United States. Its staff includes professional engineers, geologists, biologists, environmental scientists, historians, architectural historians, and archaeologists, with offices in Atlanta, Georgia; Asheville, North Carolina; Ashland, Oregon; and Nashville, Tennessee.

Archaeologyenvironmental site assessmentsgeotechnical engineeringMaterials testingNEPA AssessmentsSection 106 ReviewSite Characterization, Investigation, and RemediationTribal Consultationwetlands delineation