Who is David Becker from Digital Fortress and what is their importance?

David Becker is a handsome, well-liked university professor and linguistics specialist. He had met Susan when he was called in as a translator for the NSA. David finds himself in over his head when he agrees go to Spain for Susan's boss Commander Trevor Strathmore. David's charm and quick thinking save him from several close calls in Spain as he tries to retrieve the ring that had belonged to Ensei Tankado.