'Day will come' for woman to lead UN: UNDP boss Helen Clark Helen Clark, tipped as a possible successor to Ban Ki-moon as UN Secretary General, says the "UN's day will come" to have a female in the top job, though the former New Zealand Prime Minister refused to be drawn on whether she will enter the race. As head of the UN Development Programme, Clark warned of the effects of climate change on development, saying it could "wipe out" progress in many countries. IMAGES AND SOUNDBITES