A legal process server is someone who delivers the judicial paperwork or the service of process for a law firm, individual, corporation or organization based upon the rules of the court in the area in which the case is being held.
What is substituted service?
If a party appears to be avoiding service of court documents, a request may be made with the court to, instead of personal service (i.e. giving the document directly to the person), that the document be published in a local newspaper, served on a person believed to frequent the person or mailed to his (or her) last known address.