LOS ANGELES—Chris Alexander has been promoted to executive vice president of corporate communications and publicity at 20th Century Fox TV. He will report to Joe Earley, recently promoted to COO of Fox Television Group. Alexander most recently served as senior VP and oversees the studio’s corporate communications, publicity, talent relations and events.

WASHINGTON, DC—Comcast Corporation has promoted Rudy Brioché, Lindsey Dickinson, David Don, Jordan Goldstein, and Sam Lancaster to vice presidents in its public affairs operation. Brioché, previously executive director of external affairs, has been promoted to vice president of global public policy and policy counsel. Dickinson and Lancaster have both been promoted to vice president of legislative affairs; Don is now vice president of regulatory policy, and Goldstein is vice president of regulatory affairs.

VANCOUVER—Sierra Metals, a Canadian mining company focused on the production of silver and base metals from Peru and Mexico, has hired Victoria Vargas as vice president, investor relations and corporate communications. She will serve as liaison with investors, analysts and financial community globally. Prior to joining Sierra Metals she held roles with publicly traded mining sector companies including Iberian Minerals, Romarco, Greystar Resources and most recently Scorpio Mining.