David Crystal's accent is a mix of different things caused by the time that he's spent living in different places and interacting with different people. He also happens to be very articulate, and I really admire the way that he expresses his thoughts about complicated things so clearly. Don't forget to check out DavidChrystal.com for all of his work, his blog, videos of him speaking publicly, and more information,. including the opportunity to send him a message if you want to.