Heierli Consulting Engineers, Ltd., founded in 1957 is a private companies limited by shares, incorporated in Switzerland and Singapore respectively. A combined staff of approximately 40 engineers and specialists are engaged in civil/structural engineering, protective / security engineering and risk management.

Heierli Consulting Engineers have been actively and continuously engaged in Civil Defense consulting work for the Swiss Federal Office of Civil Defense since 1963, and they are a member of the Swiss Civil Defense Commission. They have designed many protective structures and have conducted a large number of studies concerning anticipated war scenarios, weapons effects, static and dynamic design of defense structures and life supporting systems. Outside Switzerland, Heierli Consulting Engineers have contributed to the civil and military defense efforts of nations world-wide over the last 20 years.