Process servers are licensed by the courts to serve legal papers, such as summonses, subpoenas, and court orders, to the parties involved in legal disputes. People served may include witnesses, defendants in lawsuits, or the employers of workers whose wages are being garnished by court order. Corporations can be served through their statutory agents (representatives), and unknown parties can be served as John or Jane Doe, with their true names being substituted when learned by the court. Process servers work independently or as employees of law firms and other companies.