NEW YORK & PALO ALTO, Calif.--(BUSINESS WIRE)--American Express (NYSE:AXP) today announced the opening of a new technology hub in Palo Alto, expanding its presence in Silicon Valley. The new team being assembled will focus on innovations in big data, cloud computing and mobile infrastructure. “Technology innovation is driving the company’s ongoing digital transformation, and our team in Silicon Valley is focusing on core capabilities that we expect to be key to our ability to continue to innova