negotiator

verb | \ ni-ˈgō-shē-ˌāt \ | ne·go·ti·ate

1. : to confer with another so as to settle some matter

1. : to bring about through conference, discussion, and agreement or compromise negotiate a contract

2. a : to transfer (as an instrument) to another by delivery or endorsement

   b : to convert into cash or the equivalent value negotiate a check