Science and technology in Harrisburg, PA

Established in 1881, Professional Service Industries Inc. is one of the leading engineering, consulting and testing firms in the United States. Located in Harrisburg, Pa., the company offers a range of services, such as environmental consulting, industrial hygiene and indoor-air quality services, construction materials testing engineering and geo-technical engineering. It caters to education, commercial development and entertainment industries. The company is a member of the U.S. Green Building Council (USGBC) and American Association for Laboratory Accreditation (A2LA).