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Marcy Sonneborn

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Marcy Sonneborn is Of Counsel to the firm. Her area of concentration is appellate practice. Marcy began doing appellate work for the firm in 1986. Since then, she has achieved a strong record of dismissals and reversals in the 1st and 2nd Departments of New York State’s Appellate Division.

Her wins are often cited in other cases and in treatises; for instance, a lead paint case Marcy won on appeal on behalf of MSD’s client was cited in support of five similar cases won by defendants the following year, and a landmark premises security case Marcy won involving an attack in a restaurant’s bathroom is cited in treatises for the proposition that altercations between patrons are not situations that are to be anticipated or prevented, even when a similar incident occurred previously.

Marcy Sonneborn

Marcy also works with MSD’s attorneys when they serve as trial counsel. Before working with MSD, Marcy served as Assistant Corporation Counsel for the City of New York, doing commercial litigation. She was born in New York, New York.

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    • 1979, New York State Court
    • 2011, Court of Appeals, New York State


    • New York State Bar Association


    • Cornell University, B.S.
    • New York Law School, J.D.