A publicist's job is half public relations and half advertising. A publicist promotes an individual, business, or group. They arrange for and often write newspaper articles, and schedule interviews, lectures, or other public appearances. They may also arrange for paid advertising if the client desires it.
(or press agent): The publicity professional who handles the press releases for new books and arranges the author's publicity tours and other promotional venues (such as interviews, speaking engagements, and book signings).
A publicist is a person whose job is to generate and manage publicity for a public figure, especially a celebrity, or for a work such as a book or film. Publicists usually work at large companies handling multiple clients. See more at Publicity.