Kessler, who joined SAC in 2005, is leaving to
spend more time with his family, said the source. John Casey
will become the firm's interim compliance chief.
A spokesman for the firm declined to comment.
The departure comes as SAC, once one of the world's biggest and
most successful hedge funds, turns itself into a family office
that will manage founder Steven A. Cohen's $9 billion personal
The firm was forced to stop managing money for outside investors
last November as part of an agreement to plead guilty to
insider-trading charges and pay $1.8 billion in penalties.
Kessler, who came to the Stamford, Connecticut-based firm from
Goldman Sachs, was one of a handful of top SAC officials who
received subpoenas as the government built its case against the
(Reporting by Svea Herbst-Bayliss;
editing by Prudence Crowther)
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