ARLINGTON, Va.--(BUSINESS WIRE)--Global professional services company Towers Watson (NASDAQ:TW) has been named a Leader on the 2015 Global Outsourcing 100® list by the International Association of Outsourcing Professionals® (IAOP). This is the fifth year Towers Watson has been recognized on the list, which includes 75 established Leaders and 25 smaller Rising Stars from around the world and across the outsourcing industry. Towers Watson’s overall score of 5.25 across all judging categories exce