The visually-striking office space of Towers Crescent is at the center of business and commercial life in Vienna; the town itself has spawned many successful businesses and is particularly strong in professional, scientific and technical services. By number, this accounts for the largest single employment category. The area's major employers include many well-known names in health, aerospace and scientific applications, while many other smaller but equally successful enterprises in the vicinity support and service them. Additional support comes from the Vienna Tysons Regional Chamber of Commerce, which is very active in offering networking and other business growth opportunities. The University of Fairfax has its HQ in Vienna. The office space has two international airports in close proximity, and is opposite Tysons Corner Mall.