

In 2009 Grenier was appointed Chairman of ERG Partners, an independent financial and strategic advisory firm solely focused on the security and intelligence sectors.

According to Grenier, Libby thanked him personally a few days later for the information about Wilson's trip, telling him it had been "useful". Grenier testified that later media reports about the leak, which suggested Libby may have originally learned about Plame a month later from journalists, prompted him to contact CIA lawyers about his earlier conversations with Libby. Wilson was sent on the February 2002 investigatory mission by the CIA, Grenier said, because the Office of the Vice President wanted answers about reports of uranium purchases from Niger, although the State Department and the Bureau of Intelligence and Research were interested in the CIA's take as well. Grenier testified that it was unusual to get a call from Libby, and unusual to be called out of a meeting with CIA director George Tenet to supply Libby with answers. Grenier did not mention Plame's name to Libby, which appeared in a column by Robert Novak a month later.
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On January 24, 2006, Grenier testified in Libby's trial on perjury and obstruction of justice charges, telling jurors that Libby asked him for information about Joseph Wilson's investigatory trip to Niger on June 11, 2003, and that he reported back to Libby about Wilson's wife's involvement in the trip, as well as Wilson's wife's employment by the CIA, later on June 11. Libby claims to have forgotten about the conversation. Grenier told Libby on June 11, 2003, one month before the leak of Valerie Plame's CIA identity, that she worked for the CIA and was involved in arranging her husband Ambassador Joseph Wilson's 2002 trip to Niger. In early 2006, Grenier was identified in court documents in connection with the CIA leak grand jury investigation and charges against I. In 2006, Grenier joined Kroll, Inc., as Managing Director. Grenier served as Director, CIA's Counterterrorist Center for about a year, but was fired from that position on 6 February 2006 by the Director of the National Clandestine Service Jose A.

In the summer of 2002 he was promoted to the chief of the Iraq Issues Group, where he helped coordinate covert operations in support of the 2003 invasion of Iraq. In 2001, Grenier was the CIA station chief in Islamabad, Pakistan, where he helped plan covert operations in support of the U.S. From 1996 to 1999, Grenier was Director of Operational Training at Camp Peary, Virginia. He served as Special Assistant to the Under Secretary of State for Political Affairs Peter Tarnoff (1993–94) and first Chief of Operations, Counter-Proliferation Division (1994–96). Grenier was station chief in Algiers, Algeria in 1990. Grenier joined the CIA in January 1979 and worked field assignments in North Africa, Middle East and Western Europe till 1991.
