Mandela 'a source of inspiration': Nobel Peace Prize winner Exactly twenty years to the day after Nelson Mandela delivered his Nobel Peace Prize lecture in Oslo, this year's winner says Mandela was 'a source of inspiration.' Ahmet Uzumcu, the head of the Organisation for the Prohibition of Chemical Weapons, who accepts the prize on Tuesday, said it was 'a great honour' to receive the prize twenty years after Mandela. Images and soundbites.