a person, business, that buys and sells (business shares etc) for others

financial expert

a state or law official

person who arbitrates

separate entry below

person who negotiates

a person who makes arrangements for two people who do not meet at first

person acting as an agent

(of) a person acting as a link between (groups), especially to get agreement

person who negotiates

a public official with authority to hear and decide cases in a law court

person who arbitrates

advocate

advocate