United Nations Secretary General Ban Ki-moon greets reporters upon his arrival for his first day in office. (Don Emmert / AFP/Getty Images)
UN Secretary-General Ban Ki-Moon, left, shakes hands with staff members in the lobby as he arrives at UN headquarters. (Paulo Filgueiras / AP)
New United Nations Secretary General Ban Ki-Moon carries his tray after getting his lunch in the cafeteria at UN headquarters. (Frank Franklin / AP)
The new United Nations Secretary-General meets with Russian ambassador Vitaly Churkin. (Frank Franklin II / AP)
UN Secretary-General Ban Ki-Moon, upper right, meets with his under-secretaries general. (Eskinder Debebe / AP)
