Lipsky, the first deputy managing director of the multilateral institution, "announced today that he will not seek a new term when his current term expires on August 31," the IMF said in a statement.
At the request of the IMF managing director Dominique Strauss-Kahn, Lipsky has agreed to remain as a special adviser through the G20 summit "to ensure continuity," it said.
France, this year's head of the G20 major developed and developing countries, has scheduled a November 3-4 leaders summit in Cannes.
Strauss-Kahn, under mounting speculation he will leave the IMF to become a Socialist candidate in the 2012 French presidential election against presumed contender President Nicolas Sarkozy, lavished praise on his deputy.
"From my first days at the fund, John has been a sincere friend to me, as well as an exemplary colleague, a tireless thinker, an instigator of debate, an influential proponent of multilateralism and deeper financial surveillance, and an outstanding communicator to a broad range of external constituencies," Strauss-Kahn said.
Strauss-Kahn has sidestepped questions about a potential presidential bid. He would need to declare his candidacy before July 13 to be able to participate in primary elections organized by his Socialist Party.
Lipsky, a 64-year-old American, was appointed to a five-year term on September 1, 2006, serving under Strauss-Kahn's predecessor, Rodrigo Rato.
Lipsky has a doctorate in economics from Stanford University and has also worked in the private sector, notably as chief economist for three large banks: JPMorgan, Chase Manhattan, and Salomon Brothers.
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