Percival Barretto-Ko has been appointed president, Americas Operations, for Astellas US LLC, with responsibility for the company’s North and South America operations. Mr. Barretto-Ko previously served as senior vice president, International Operations. He will be located in Northbrook and reports to president and chief executive officer Kenji Yasukawa.   Mr. Barretto-Ko joined Astellas in 2005 to lead Astellas Pharma Europe’s corporate strategy organization. In 2011, he was promote...