GTT announced that Marc Haestier has joined the company as Chief Financial Officer. Marc Haestier leaves Engie were he has been, since 2010, CFO of the Infrastructures Business Line. He began his career holding various financial positions within Arjo Wiggins between 1985 and 1997, in Belgium and subsequently in the United Kingdom, before joining Alstom in Paris in 1997 as Director of Treasury and Financing. He then moved to Gaz de France in 2004 as Deputy CFO.