>> the head of the swiss national bank -- bank philip hildebrand, has been brought down, anand inlvesighly controversial and profitable currency exchange deals carried out by his wife. the trades were made just before and just after he took steps to weaken the swiss franc. while he denies providing his wife with inside information, he acknowledged that he cannot prove his innocence and has reside with immediate effect. >> in the end, philip hildebrand bowed to bring pressure. he joined the central bank it thousand three and became president two years ago. but, recently, he made headlines due to his wife's currency transactions. she runs an art gallery in zurich. in mid-august, the former currency trader purchased over half a million u.s. dollars. she profited handsomely after the swiss national bank intervened to lower the value of the franco a short time later. >> after thoroughly checking the documentation and careful consideration since the press conference, i have come to the conclusion that it is not possible to provide conclusive evidence that my wife initiated the foreign curre