António Guterres begins work this week as the new Secretary-General of the UN. Former chief of staff to Kofi Annan, Mark Malloch Brown, offers his advice on how to perform the toughest job in diplomacy.

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Mark Malloch-Brown is a former chief of staff and Deputy Secretary General of the United Nations. he was the principal advisor to former UN Secretary General Kofi Annan from 2005 to 2006.

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