Mark S. Arisohn



Mark S. Arisohn focuses on prosecuting complex securities fraud cases on behalf of institutional investors. Mark is an accomplished litigator, with nearly 40 years of extensive trial experience in jury and non-jury matters in the state and federal courts nationwide. He has also argued in the New York Court of Appeals, the United States Court of Appeals for the Second Circuit and appeared before the United States Supreme Court in the landmark insider trading case of Chiarella v. United States.

Mark's wide-ranging practice has included prosecuting and defending individuals and corporations in cases involving securities fraud, mail and wire fraud, bank fraud, and RICO violations. He has represented public officials, individuals, and companies in the construction and securities industries as well as professionals accused of regulatory offenses and professional misconduct. He also has appeared as trial counsel for both plaintiffs and defendants in civil fraud matters and corporate and commercial matters, including shareholder litigation, business torts, unfair competition, and misappropriation of trade secrets. aa

Mark is one of the few litigators in the plaintiffs' bar to have tried two securities fraud class action cases to a jury verdict.

Mark is an active member of the Association of the Bar of the City of New York and has served on its Judiciary Committee, the Committee on Criminal Courts, Law and Procedure, the Committee on Superior Courts, and the Committee on Professional Discipline. He serves as a mediator for the Complaint Mediation Panel of the Association of the Bar of the City of New York where he mediates attorney client disputes and as a hearing officer for the New York State Commission on Judicial Conduct where he presides over misconduct cases brought against judges.

Mark also co-leads Labaton Sucharow's Securities Arbitration pro bono project in conjunction with Brooklyn Law School where he serves as an adjunct professor. Mark, together with Labaton Sucharow associates and Brooklyn Law School students, represents aggrieved and defrauded individual investors who cannot otherwise afford to pay for legal counsel in financial industry arbitration matters against investment advisors and stockbrokers.

Mark was named to the recommended list in the field of Securities Litigation by The Legal 500 and recognized by Benchmark Litigation as a Securities Litigation Star. He has also received a rating of AV Preeminent from publishers of the Martindale-Hubbell directory.



Columbia Law School
J.D., 1972

Cornell University
M.S., 1969

Cornell University
B.S., 1968


1973, New York

1978, U.S. Supreme Court

U.S. Court of Appeals

1975, Second Circuit
2011, Eleventh Circuit

U.S. District Court
1973, Southern District of New York
1973, Eastern District of New York
1982, Northern District of Texas
1984, Northern District of New York