The phrase "a middleman of" is correct and usable in written English.
It can be used to describe someone who acts as an intermediary in a transaction or communication between two parties.
Example: "In the negotiation process, he served as a middleman of the two companies, facilitating discussions and agreements."
Alternatives: "an intermediary for" or "a broker between".
The SFO discovered that the money had gone into a Swiss bank account controlled by Sailesh Vithlani, a middleman of Indian extraction with a British passport.
Tapes from the prosecutor's office, leaked and then broadcast on television, show the farm minister, Decebal Traian Remes, apparently taking delivery via a middleman of €15,000 ($21,600), 20 kilos (44lb) of sausages and 100 litres (22 gallons) of plum brandy.
Does that make Google like Wal-Mart, as Carr suggests, a middleman of such might that it squeezes everybody else's margins?
As a prominent "fixer", a middleman of sorts for the political and social honchos, whose job it is to introduce influential figures to one another to expand their networks, told me, "The most effective meetings are outside the meeting rooms".
Goodwin said she had described "a person who passed money on, like a middleman, for one of our targets". Dalton felt vindicated.
But Arum described in greater detail today the $100,000 he says he paid through a middleman to the founder of the I.B.F., Robert Lee Sr., in early 1995.
"He was kind of like a middleman for a clothing supplier.
The track was also allowing "10 percenting" to occur, a practice in which a bettor pays a middleman 10percentt of a ticket's earnings if the middleman cashes the ticket.
There's the obvious concern of RIM acting as a middleman (by way of their Blackberry Enterprise Server) for the delivery of Presidential emails.
He's a middleman, keeping track of what happens in the townships, getting the work into the public eye, setting up exhibitions in rented spaces.
