Xiong worked with QFS for almost 14 years and left the firm in mid 2011 to take a sabbatical from the industry, said the firm.
He joined QFS in 1997, and prior to this, he developed financial applications for Salomon Brothers and was a management scientist at General Electric’s center for research and development.
Before that he worked as a team leader at CAE Electronics (in Canada), responsible for developing energy management systems.
QFS CEO Karlheinz Muhr said, "I am delighted that Jim has decided to return to QFS. During his first 14 years at the firm, Jim played a key role in growing QFS and in contributing to its world-class research process."
QFS has also selected David L Zimmerman, the firm’s general counsel, as chief operating officer, and Dan Bender as chief financial officer.
Both executives will assume the responsibilities of Robert Shustak, who is retiring from the firm at the end of August.
Zimmerman is a partner in the firm and has been general counsel of QFS since February 2006, while Bender joined QFS in May 2012 as the firm’s managing director of accounting and finance.
Before joining QFS, Bender acted as the chief financial officer of Ramsey Asset Management, a long/short equity hedge funder manager in the Washington, DC area.
