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Mr. Sonn focuses his practice principally on complex securities litigation matters, including class actions.

During his career, Mr. Sonn has litigated numerous cases to successful resolution, recovering many millions of dollars for defrauded investors. He recently won a $50 million final judgment in Katz v. MRT Holdings, one of the few cases in the Private Securities Litigation Reform Act passed in 1995 to yield a final judgment on the merits.

Frequently, Mr. Sonn serves as a television commentator on securities fraud and ponzi scheme cases for CNBC, The CBS Sunday Morning Show, BBC Radio, ABC and MSNBC.

Mr. Sonn was the CNBC contributing...