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Roxann Dawson, now primarily a producer, played Lt. B'Elanna Torres on Star Trek: Voyager
So, to recap, on 7/7/11, I sent 3x 8x10s, LOR and SASE to both:
Roxann Dawson
c/o Andrea Simon Ent.
Removed (Outdated)
AND
Roxann Dawson
United Talent Agency
9560 Wilshire Blvd.
Suite 500
Beverly Hills, CA 90212-2401
USA
...
Turns out the first address was outdated and was RTS, so on 7/20/11, I resent the first packet to the updated address:
Andrea Simon Ent.
4230 Woodman Ave.
Sherman Oaks, CA 91423
In Oct/Nov, 2011, I received back all 3 8x10s signed!
She hasn't done a convention in a while, and she seems to be very busy in television production, so I didn't think I'd hear back! But, one of the two addresses worked (sadly I lacked the foresight to mark the return SASEs to know which address was successful) but one of them certainly worked!
Great Success 
updated 3/9/2024