The New York Times reports that Klein, who runs M. Klein & Co - which is basically a one-man M&A shop - will pick up a sizable fee after acting as an honest broking and facilitating the $41bn merger between Glencore International and Xstrata.
Although there were around 18 firms involved in the deal, Klein's advice is thought to have been key in pushing the deal to a successful conclusion.
Soon after leaving Citi in 2008, Klein advised Bob Diamond and the Barclays board in the purchase of Lehman's US businesses. He is thought to have bagged a $10m fee for his work on that occasion.
The biggest personal M&A fee in history is thought to be the $35m Jospeh Perella made in 2005, when he paved the way for Bank of America's purchase of credit card company MBNA.
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