Jonathan M. Peacock, executive vice president and chief financial officer, is leaving Amgen to pursue other opportunities. Mr. Peacock will be stepping down from his role on January 10, and will remain with the company to assist with the transition. Michael A. Kelly has been named acting chief financial officer, reporting to Robert A. Bradway, chairman and chief executive officer.   “Since joining Amgen over three years ago, Jon has played an important role in developing and implementing t...