Isaac is THE most organized designer I know. He always ensures that his assets are in order and makes it easy for other designers to work on them.
On DTI/Epiq, Isaac has also been really good at critiquing and bringing new ideas to the table. He takes feedback well and easily comes up with alternatives. The musician in Isaac made him come up with the idea of looking at bundles [legal document collections] as 'playlists' and borrrowing this concept has helped us easily communicate with the developers.