Home Videos ITB Berlin 2015 John Greenleaf, global head, DoubleTree by Hilton 9 March 2015 Embed Embed Code Close John Greenleaf, global head of DoubleTree by Hilton talks to Breaking Travel News at ITB 2015. Previous VideoMarcello Cicallo, Director of Sales & Marketing, Italian Hospitality CollectionNext VideoHolger Schroth, general manager, Emirates Palace