He will provide strategic advice to the company in the newly created role following the expansion of its fund range this spring.
Warren worked at Thames River from 2007 to 2012, where he controlled investment teams, sales and marketing teams and product development.
He has also held senior positions at HSBC Investment UK and Deutsche Asset Management, where he was main board director.
On the appointment, Alquity chief executive Paul Robinson said: “With Michael joining us at a time of expansion, I am confident that he will help us in our mission and be an integral part of transformation that the industry needs.”
In April, the company marked its global expansion with the release of three Luxembourg-domiciled funds: the Alquity Latin America Fund, the Alquity Asia Fund and the Alquity Indian Subcontinent Fund.
At the time, Robinson said: “The launch of three new funds marks a step change in the global reach of Alquity’s investment model, building on the track record of our landmark Africa fund.”
Based in London, Alquity Investment Management is part of the Alquity group and has $99m in assets under management.
Absolute return and multi-manager specialist Thames River was acquired by F&C Asset Management in 2010 in a deal worth £34m.
Following the acquisition F&C also took over management of Nevsky, an emerging market subsidiary of Thames River. In December 2011, the company closed its last offshore fund, the Dublin-based Multi-Select Fund, in the “best interests of the shareholders”.
In May this year, F&C was taken over by the Bank of Montreal for £708m in cash.