there are some articles out there. but there is not any real decent overviews or anything. he's a private guy. personally, i think he's maybe the single most important designer of the last quarter-century. but i absolutely refuse to argue that here with this crowd.
i wish someone would do a GOOD book on him. but, the design world doesn't like him much. they really don't understand what he does. i mean, just look at his color sense. that alone is enough to put him in a league of his own. man, he's good.