Here is his chart without the hour of birth:
I'm kind of confused about him..I usually can guess people's ascendants, but he is just too weird. lol.
My guess would be an Asc in early Capricorn, conjunct Neptune in late Sag, square Mercury in 24 Virgo, trine Mars and Venus.
But his skinny body and perpetually worried expression definitely says Saturn on ascendant influences.
Another option I thought of was Scorpio Rising with Saturn conjunct Asc, but, dunno, somehow, I just don't see him as a Scorp Rising..or don't want to. lol
Third option would be asc is Late Libra, conjunct both Pluto and Saturn.
For those who don't know him, he played the Facebook founder in the film "The Social Network" from 2010.
Here's a video of him, the actor: http://www.youtube.com/watch?v=BZozYsCc08g