2010/1/2 Ian A. Holton poeloq@gmail.com:
I don't think that contacting him via Twitter would be the most effective way - you can imagine how many DM and @ he gets per minute at over 1 million followers ;) How was the agent contacted, E-Mail? I often find the the traditional telephone call can often work wonders.
He frequently replies to people that talk to him on twitter. When I contacted his agent it was by email, a telephone call might work but there is no guarantee you'll get to talk to anyone other than his agent's secretary.