Thomas Bell-Wright International Consultants is a privately held engineering firm providing independent quality assurance and testing services for the exterior wall systems of large buildings, and testing of fire containment systems and materials in buildings.

TSI Incorporated serves a global market by investigating, identifying and solving measurement problems. As an industry leader in the design and production of precision measurement instruments, TSI partners with research institutions and customers around the world to set the standard for measurements relating to aerosol science, air flow, indoor air quality, fluid dynamics and biohazard detection.