A system and method for dynamically creating individualized, multi-media messages and to deliver the messages to specific target groups or individual viewers. A message, story, or advertisement is assembled on demand, based upon rules applied to each viewer's profile and a library of media segments. The framework for the final personalized message is a story or message template designed for a campaign. A set of viewer profiles is assembled from designated databases for each of the targeted entities. A collection of media segments is also created or selected and then made available to produce the final personalized message at assembly time. Specific media segments are selected and merged according to the message template and information about the viewer derived from each viewer's profile. The information from the viewer profile is interpreted by a rule system to determine which of several potential media segments to select for use in the personalized message. The merged composite is then encoded to match the distribution media and forwarded to the viewer.