Tony J. Hunt has been appointed chief executive officer of Repligen Corp. Mr. Hunt, currently Repligen’s chief operating officer, succeeds Walter C. Herlihy, Ph.D., who will retire in May 2015.   “Under Walter’s leadership, Repligen has been transformed from a therapeutics company that produced bioprocessing products into a focused bioprocessing industry leader, providing high-value consumable products for biological manufacturers and creating substantial value for our stockhol...