Showing yet again that mobile payments is experiencing a talent shortage, American Express announced it has snagged David Yoo, direct carrier biller Boku's VP of Strategy, Product and Marketing. He'll be leading Amex's Commerce Innovation team looking at new products for American Express cardholders.  

Yoo joined Boku in January 2010 from PayPal, where he led the marketplace payments group and launched eBay express and digital goods payment.