intercessor

one who works with opposing sides in order to bring about an agreement eventually, they hired an intercessor, because they were getting nowhere on their own Synonyms broker, buffer, conciliator, go-between, honest broker, interceder, mediator, intermediary, intermediate, interposer, middleman, peacemakerRelated Words troubleshooter; moderator; bargainer, negotiant, negotiator; appeaser, pacificator, pacifier, reconciler; agent, attorney, deputy, factor, procurator, proxy; liaison, medium; ambassador, emissary, envoy, legate, messenger; delegate, representative; busybody, interferer, meddler; arbiter, arbitrator, judge, referee, umpire; adviser (also advisor), counselor (or counsellor)