A Multimedia production might include any or all of the following people:
Writers (for the scripts).
Although tech writers seem like the obvious people to write the text, the
creative aspect of multimedia can often be best addressed by a writer
passionately involved in the subject matter. A poet was used by X Communications for one of their productions.
Photographers
Composers (if there is to be music because of the legal issues in copyrights)
Video Producer
Designers - graphic designers with knowledge of how to design for the screen.
Audio Engineer
Programmers