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Callahan Associates Inc.(CAI), was founded in 1973 by Edward E. Callahan.P.E., F.ASCE. CAI is a consulting structural Engineering services firm which for several years offered structural design, inspections, investigations, reports, testing of building products and components involving commercial, industrial and residential construction. These services are provided to Architects, other Engineers, Building Contractors, manufacturers of building products, building component manufacturers, city and county facilities, inspection departments and the legal profession.

The current trend in demand for structural Engineering services for today's building construction market has required additional specialized needs. Callahan Associates began to meet these needs by expanding our services to include Forensic investigations of building collapses, related expert consultation and expert witness service.

While continuing work on buildings and components constructed of materials such as steel and concrete, in 1998 an associated firm Callahan Systems Group (CSG) was formed. This division provides technician services to the wood truss industry and building contractors. These services involve providing wood roof and floor preliminary estimating services and wood truss installation inspections for builders and contractors. Engineering support services when needed continue to be provided by CAI.