Harland was appointed HD 's Executive Director in 2011 . He currently also sits on the United Nations Secretary-General 's High-level Advisory Board on Mediation . Prior to that , Harland was Adjunct Professor at the Johns Hopkins School of Advanced International Studies ( SAIS ) , and Chair of the World Economic Forum Global Agenda Council on Conflict Prevention . Before joining HD as Executive Director , Harland served as Director of the Europe and Latin America Division of the United Nations Department of Peacekeeping Operations ( 2006 – 2011 ) . He served in United Nations peacekeeping missions in Haiti ( 2010 ) , Kosovo ( 2008 ) , Timor Leste ( 1999-2000 ) and Bosnia and Herzegovina ( 1993 – 1998 ) . During 1999 , he was released from his regular duties to research and draft the United Nations report on the Srebrenica massacre , " The Fall of Srebrenica " . He served as a Teaching Fellow at Harvard University from 1989-1991 . Harland served as a witness for the prosecution at the International Criminal Tribunal for the former Yugoslavia in the cases of " The Prosecutor versus Ratko Mladic " ( 2012 ) , " The Prosecutor versus Radovan Karadžic " ( 2010 ) , " The Prosecutor versus Dragomir Miloševic " ( 2007 ) , and the Prosecutor versus " Slobodan Miloševic " ( 2004 )
Srebrenica massacre
Srebrenica massacre
David Harland