860
Al - Douri taught international law at Baghdad University for over 30 years before becoming a diplomat in 1999 , first at the United Nations in Geneva and since early 2001 at U . N . headquarters in New York .
 ( start position: becoming,  Al - Douri: person, United Nations: place, headquarters: place, U . N: entity) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: declare bankruptcy, transfer ownership, transfer money, marry, transport, die, phone write, arrest jail, convict, sentence, sue, end organization, start organization, end position, start position, meet, elect, attack, injure, born, fine, release parole, charge indict, extradite, trial hearing, demonstrate, divorce, nominate, appeal, pardon, execute, acquit, merge organization, Arguments type: beneficiary, prosecutor, plaintiff, seller, victim, buyer, agent, destination, artifact, organization, recipient, person, place, origin, target, giver, adjudicator, attacker, vehicle, defendant, entity, instrument. 
Text: {0} 
Answer:
 ( start position: becoming,  Al - Douri: person, United Nations: place, headquarters: place, U . N: entity) 