Harold Brook has been promoted to senior VP, business affairs and business affairs administration, at NBC Entertainment.Brook, who had been VP of business affairs, adds administration to his program supervision and talent acquisition duties. Andy Murphy has been promoted to VP, cable affiliates, at Fox Broadcasting Co. He will oversee Fox Net and the operations division of Fox Latin American Channel. He was VP of operations at Fox Net. Kieran Clarke, an account exec with the TV station rep firm TeleRep, has been named national sales manager for Tribune Broadcasting’s KTLA. Clarke replaces Steve Berman, who was promoted to local sales manager at sister station WPIX-TV in N.Y.