MCLEAN, Va.--(BUSINESS WIRE)--GTT Communications, Inc. (“GTT”) (NYSE:GTT), the leading global cloud networking provider to multinational clients, will present at the Jefferies 2015 Global Technology, Media and Telecom Conference in Miami, FL on May 12-14, 2015. Rick Calder, GTT President and CEO, and Mike Sicoli, CFO, will present on Thursday, May 14th at 8:30 am ET and meet with investors that day. To view the latest GTT investor presentation, please visit www.gtt.net. About GTT GTT operates a