Professional Service Industries is an engineering, consulting and testing firm. It operates more than 120 offices in the United States. Established in 1881, the firm maintains a work force of over 2,500 employees. Professional Service Industries provides technical and management solutions for the public and private sectors. The firm offers site selection, construction and property management services. It serves the energy, manufacturing, retail, entertainment, transportation, government and health care industries. Professional Service Industries clients include shopping center owners, hotels and financial institutions. The firm provides environmental consulting and geotechnical engineering, nondestructive examination, and corrosion, environmental and investigative structural testing solutions.