QEI is a Disadvantaged Business Enterprise (MBE, DBE) consulting, engineering, and surveying firm based in Chicago, IL. We wo ... rk with our clients to provide quality and professional services with an emphasis on technical details, accuracy, and professionalism. Our extensive background allows us to provide creative solutions during all phases, including designing, permitting and construction. OEI’s accomplished team of engineers, surveyors, scientists, and technicians highlight all the details to better provide our clients with a sense of security and assurance. read more