Wiss, Janney, Elstner Associates, Inc. (WJE) is an American engineering firm that specializes in the investigation, analysis, testing, and design of repairs for historic and contemporary structures. The company was founded in 1956 and is headquartered in Northbrook, Illinois. WJE has worked on a number of high-profile projects, including the restoration of the Statue of Liberty and the investigation of the collapse of the World Trade Center towers on September 11, 2001. The company has more than 1,200 employees and operates offices throughout the United States and abroad.