Sean R. O'Brien has successfully represented individuals, hedge funds, private equity firms, corporations and financial institutions in a range of complex civil, regulatory, and criminal proceedings. Mr. O'Brien's practice has principally involved securities matters and disputes arising out of complex financial transactions, including shareholder and partnership disputes. Prior to joining the firm, Mr. O'Brien was with Sullivan & Cromwell, where for one year he litigated his own prisoner civil rights cases as the firm's Pro Bono Fellow, and later practiced in the areas of securities and antitrust litigation.
Notable representations include:
- Represented individual in United States v. Stein, et al., a tax shelter prosecution,
obtaining dismissal of all claims based upon governmental interference with
company's obligation to advance attorneys' fees; - Represented sole manager of $1.3 billion dollar hedge fund in dispute and action brought against him arising out of dissolution of fund, obtaining dismissal of all claims;
- Represented a top-five law firm and partner defending against multi-million dollar
claims arising out of a merger transaction, obtaining dismissal of all claims; - Represented world-renowned art gallery and family owners defending against an
action seeking the recovery of valuable art looted during World War II, obtaining dismissal of all claims; - Defended leading investment bank in action alleging breach of contract and fraud in connection with private securities offering, obtaining dismissal of all claims;
- Represented minority shareholders in a family dispute involving one of the
country's largest private corporations, obtaining a favorable buy out; - Represented venture capital firm and its principals in an array of federal and state
court litigations relating to an investment in an e-commerce venture, obtaining
dismissals of all principal claims and a favorable settlement; - Defended a chief executive officer and chief financial officer in a federal SEC
enforcement trial, parallel criminal investigation, multiple civil actions and arbitration; and - Represented Microsoft Corporation as member of trial team in United States v.
Microsoft Corporation, an antitrust enforcement action brought by the
Department of Justice.
Mr. O'Brien was born in Ridgewood, New Jersey.
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