The leader of the pack, Contemporary Services (CSC) provides security management services for large entertainment and sporting events. The company specializes in crowd control and guest management for professional and collegiate athletic games, performances, and other private and public gatherings. Services range from parking management to ticket taking, ushering, and box office assistance. The company's customers include hosts for such prestigious organizations as the NFL, NBA, NHL, and NASCAR (more than 100 stadiums and arenas), as well as 100 higher education institutions, and 30 convention centers.