After nearly 24 years with PMK public relations, Carol Marshall has left PMK/HBH to form her own firm. As of May 1, she has launched Carol Marshall Public Relations, working with her assistant Alanna Kordell. Marshall, who has worked with a number of film festivals, including the Santa Barbara International Film Festival and the Palm Beach International Film Festival, said that she is currently setting up a new office and will work with a number of her regular clients.