Alpharma, Inc. has named Dean J. Mitchell president and chief executive officer succeeding Ingrid Wiik, who planned to retire once a successor was named. Mr. Mitchell has nearly three decades of senior management experience working at global pharmaceutical companies including Bristol-Myers Squibb and GlaxoSmithKline. Mr. Mitchell also worked in strategic planning and product development and commercialization. He was most recently president and chief executive officer of Guilford Pharmaceuticals,...