Thanks for your info. I am leaning towards this solution if there is no mentioning of any specific names of narrators/speakers in the script. Other scripts might include this particular information.
So, AT could stand for audio talent which is the same as voice talent or here a speaker/commentator who handles most of the scenes.
I am not really sure. Any confirmation or correction from colleagues would be great.


http://www.aegee.tv/24.htmlVoice-Over Story (V/O) - The spokesperson/narrator talks, while different pictures are being shown on the screen. Visuals are accompanied by narration from someone off camera.
Voice-Over to Sound (V/O to SOT) - The spokesperson/narrator talks, directly introducing the next scene in the movie and the 100% voice takes over.

http://fullermedia.com/talent.htmlaudio talent = voice talent

http://www.globe.gov/hq/videos/scripts/Longoverviewvideo.htm... example listing voice (audio) talents


http://www.alexwarner.com/ger/
Prof-Sprecher/ voice talent

http://www.suchspion.at/cgi-bin/gsuchen.pl?q=sprecherin&id=W...
Sprecherin


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Note added at 6 days (2007-05-25 16:31:09 GMT)
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fix: Prof*i*- SprecherIn