facilitator [facilitators](person who helps a group to have an effective dialog without taking any side of the argument) noun [UK: fə.ˈsɪ.lɪ.teɪ.tə(r)] [US: fə.ˈsɪ.lə.ˌte.tər]
mediator [mediators](one who negotiates between parties seeking mutual agreement) noun [UK: ˈmiː.dɪeɪ.tə(r)] [US: ˈmiː.di.ˌe.tər]He was a mediator. = Era un mediatore.