ISG Thermal Systems is the world leader in thermal imagers for the highly specialized field of firefighting with thousands of imagers installed in fire, police and naval departments in over 75 countries worldwide. ISG is ......ISG Thermal Systems is the world leader in thermal imagers for the highly specialized field of firefighting with thousands of imagers installed in fire, police and naval departments in over 75 countries worldwide. ISG is headquartered in the United Kingdom, in the suburban London area of Basildon, Essex, UK, in proximity with other high-tech electronics developers. The Basildon Engineering Center is the heart of ISGs developmental programs, as well as being the manufacturing center for most of Europe and Asia. In the USA, complementary research and development efforts operate out of our Atlanta, Georgia Technical Center. Additionally, the Atlanta facility is responsible for manufacturing and service work for the United States and the North American market. ISG Thermal Systems is a privately held organization incorporated in the UK and the USA.