Sometimes it is necessary or appropriate to use the real names of someone famous in your novel for authenticity purposes or for effect. What I would like to know is does an author require authorization from the famous person being used in the story? I understand it to be that as long as the reference to the famous person are in good taste then one does not need to worry about any potential backlash and therefor does not require authorization. Am I wrong? I would like to hear from other authors and what they believe is the correct use of the names of famous people and or the famous person in their story.