A "trained mediator" is someone who has received instruction or education on how to help resolve conflicts or disputes between two or more people in a fair and unbiased way. Full definition
Since becoming a formally trained mediator in 1995 and a collaboratively trained attorney not long after, I have exclusively devoted my practice to assisting clients with alternative dispute resolution methods. (mediate.com)
An increasing number of solicitors specialising in family law are also trained mediators. (moneyadviceservice.org.uk)
The court sometimes offers trained mediators who can help negotiate an agreement. (divorcesource.com)