An online curriculum says "Gourevitch is an American entrepreneur with over 10 years experience in investment banking and management consulting." He was president of Virage Consulting Ltd, a U.S. based management consultancy between 2001 and 2007, and a director of Asian Universal Bank (AUB), a commercial bank based in the Kyrgyz Republic, between 2006 and 2009. Other managerial roles included senior vice-president of Investment Bank of Africa, CEO of a New York hedge fund, Gamma Square Partners, and director of GSN Tech LLC, described as an "offshore software development" company.

In a Twitter posting sent on January 19, Gourevitch responded to allegations of money laundering at the Asian Universal Bank under the heading: "Some undeserved answers for Argodan." The allegations had been refuted after a thorough audit by the National Bank of the Kyrgyz Republic and the international detective agency Kroll Associates, he claimed.

The accusations lost all credibility when one considered that "well-known and ethically spotless people" such as former U.S. senators Bob Dole and John Bennett Johnston had accepted seats on the AUB board, Gourevitch wrote in his reply. Gourevitch is listed as contributing $4,600 for the unsuccessful re-election campaign of Dole's wife, Elisabeth, in 2008.

Writing as CEO of MGN Group, an international investment bank based in the Kyrgyz Republic, Gourevitch acknowledged that the country needed to improve corporate governance and transparency. "We have an educational role," he wrote in an article published in a special advertising section of BusinessWeek magazine.

A 2008 article in The Times of Central Asia pointed out MGN's role as advisor to a consortium that participated in the privatization of Kyrgyzstan's national telecom operator Kyrgyztelecom and praised the bank for its "comprehensive AML (Anti-Money Laundering) Program".