FacultyFaculty/Author Profile

Mary Kay Dunning

Gibson, Dunn & Crutcher LLP

New York, NY, USA

Mary Kay Dunning is an associate in the New York office of Gibson, Dunn & Crutcher and a member of the Firm’s Litigation Practice Group. Ms. Dunning’s practice includes securities and complex commercial litigation, white collar defense and investigations, and global anti-corruption matters.

Ms. Dunning has represented financial institutions and individuals in insider trading investigations and regularly counsels clients regarding compliance with the securities laws. Recently, she was a member of the Gibson Dunn team that secured a jury trial victory on behalf of Wynnefield Capital and its portfolio manager, Nelson Obus, in SEC v. Obus, one of the longest running insider trading cases in history. Ms. Dunning also has experience in counseling boards of directors of public companies on corporate governance issues, and she has worked on teams that have conducted confidential investigations for boards of directors and privately held companies. Her practice also includes representing multinational companies in government and internal investigations pursuant to the U.S. Foreign Corrupt Practices Act, and she assists clients in drafting FCPA policies and strengthening their anti-bribery compliance programs.

Ms. Dunning is the Vice Chair of the Firm’s Associates Committee. Her pro bono work includes matters related to civil rights and immigration. She was part of a team of Gibson Dunn attorneys who represented plaintiffs on a pro bono basis in a high-profile immigration civil rights case (Barrera v. Boughton), which resulted in a favorable settlement for the plaintiffs and earned Gibson Dunn the National Legal Aid & Defender Association’s 2010 Beacon of Justice Award.

In 2013, Ms. Dunning was recognized by Super Lawyers New York Metro as a “Rising Star” in Business Litigation. She was also recognized as one of the Top Women Attorneys in Metro New York Rising Stars, as published in The New York Times Magazine in May 2014.

In 2004, Ms. Dunning graduated from Georgetown University Law Center, where she was the Publications Editor of The Tax Lawyer. Upon graduation, she served as a law clerk to The Honorable Deborah T. Poritz, Chief Justice of the New Jersey Supreme Court. Ms. Dunning received a Bachelor of Arts degree summa cum laude in Romance Languages and Literatures from Princeton University in 1999. She then joined Teach For America and spent two years teaching public school in Newark, New Jersey, before going to law school.

Ms. Dunning is admitted to practice law in New York, New Jersey, the District of Columbia, and the United States District Court for the Southern and Eastern Districts of New York.


Securities Enforcement
Securities Litigation
White Collar Defense and Investigations


Georgetown University
2004 Juris Doctor
Princeton University
1999 Bachelor of Arts


District of Columbia Bar
New Jersey Bar
New York Bar


Implications Of The SEC's Recent Trial Losses

2013 Year-End Securities Enforcement Update

Webcast - Financial Institutions in the Crosshairs: The False Claims Act and FIRREA

2013 Mid-Year Securities Enforcement Update

Does That Settle It? Well, Maybe Not
Mary Kay Dunning is associated with the following items:
CHB Chapters  CHB Chapters 2018 Mid-Year Securities Enforcement Update (July 30, 2018) - Directors' Institute on Corporate Governance (Sixteenth Annual), Thursday, November 29, 2018

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