Aug 19 (Just Earth News)Secretary-General António Guterres and Stephen O'Brien, Under-Secretary-General for Humanitarian Affairs and Emergency Relief Coordinator, pose for a group photo with participants at a special event under the theme, “Staff Stand Together”, marking World Humanitarian Day (19 August). also pictured, Bibi S. Khan, President of the United Nations Staff Union in New York. UN Photo/Evan Schneider more