Authors with President Profession President Michel Martelly president President Miguel Diaz-Canel president President Michael Schill president President Michael Benson president President Mauricio Macri president President Mattarella president President Martin Vizcarra president President Martin Lau president President Marius Vizer president President Mandela president President Maithripala Sirisena president President Mahmoud Abbas president President Mahamadou Issoufou president President Macron president President Ma president President Lungu president President Lopez Obrador president President Lincoln president President Lenin Moreno president President Lee Won-hee president «678910111213141516»