mediator

[ mee-dee-ey-ter ]

/ ˈmi diˌeɪ tər /

a person who mediates, especially between parties at variance.

Origin of mediator

1250–1300; < Late Latin (see mediate, -tor); replacing Middle English mediatour < Anglo-French < Late Latin, as above

me·di·a·tor·ship, noun un·der·me·di·a·tor, noun

I may it clear that I have no authority to wade into conflicts between parents, and my role is not that of mediator.

Pediatrician: Don’t Make Your Kid’s Healthcare a Proxy in Your Divorce Battles |Russell Saunders |February 14, 2014 |DAILY BEAST
But exacting concessions from the mediator is not the point.

Jonathan Pollard Means Israeli-American Squabbling Instead of Israeli-Palestinian Negotiation |Raphael Magarik |July 26, 2013 |DAILY BEAST
When companies find themselves in seemingly irresolvable disputes with each other, they often bring in a mediator.

Washington Should Use CEOs as Mediators to Resolve Debt Debate |Tom Rogers |February 12, 2013 |DAILY BEAST
“I think they know their interests lie in being a mediator in this case and brokering a ceasefire,” she said.

War in Gaza Poses Risks for All Sides |Dan Ephron |November 16, 2012 |DAILY BEAST

IGF-1 functions as a mediator for human growth hormone (HGH), which plays a critical role in the aging process.

Unlocking Alzheimer's |Hannah Seligson |December 10, 2009 |DAILY BEAST
The poor must ever have a champion, a savior, a mediator, or they are ground beneath a relentless heel.

A Tame Surrender, A Story of The Chicago Strike |Charles King
The Mediator conducts the destroying angel to fulfil the will of God.

Notes On The Apocalypse |David Steele
But am I not still unrestrained from declaring myself the entitler, the mediator, and the own self?

The Ego and His Own |Max Stirner
The State cannot endure that man stand in a direct relation to man; it must step between as—mediator, must—intervene.

The Ego and His Own |Max Stirner
He was to act as mediator between them and the inhabitants of the countries they were to visit.

Great African Travellers |W.H.G. Kingston