Mary Pat Dwyer


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Mary Pat Dwyer advises clients through government investigations, enforcement actions, and regulatory matters.  Mary Pat has significant experience counseling clients through internal investigations and criminal and civil inquiries from federal regulators.  She regularly assists clients with obtaining clearance from the Committee on Foreign Investment in the United States (CFIUS) for cross-border transactions.   Mary Pat also counsels clients on compliance with international trade laws, including economic sanctions, tariffs, anti-money laundering laws, and export controls.

Mary Pat maintains an active pro bono practice, with a focus on immigration law and policy.  Her recent pro bono work includes obtaining asylum for an unaccompanied child and securing repatriation for a wrongfully deported permanent resident.

Prior to joining O’Melveny, Mary Pat was a law clerk for the Honorable Stanley Marcus of the US Court of Appeals for the Eleventh Circuit and the Honorable Graham C. Mullen, III of the US District Court for the Western District of North Carolina.


Bar Admissions

  • District of Columbia
  • Pennsylvania

Court Admissions

  • US District Court, Eastern District of Pennsylvania


  • Duke University, J.D., summa cum laude; Order of the Coif, 2014
  • University of Notre Dame, B.A., cum laude, Political Science, 2011

Professional Activities


  • Honorable Graham C. Mullen, III, US District Court, Western District of North Carolina
  • Honorable Stanley Marcus, US Court of Appeals, Eleventh Circuit

Alerts and Publications

Trump Administration Takes Further Actions Targeting China as Term Nears End

December 21, 2020

President Trump Issues Executive Order Prohibiting US Investments in Companies with Ties to the Chinese Military

November 16, 2020

Preliminary Injunctions Delay Implementation of Commerce Department Orders Targeting TikTok and WeChat

October 1, 2020

CFIUS Issues Final Rule Revising the Mandatory Declaration Requirement for Foreign Investments in US Businesses Involved with Critical Technologies

September 15, 2020

Trump Administration Continues to Target TikTok and Huawei

August 21, 2020

President Trump Issues Executive Orders Prohibiting Transactions with TikTok and WeChat

August 9, 2020

CFIUS Proposes Revision to Mandatory Declaration Requirement for Foreign Investments in US Businesses Involved with Critical Technologies

May 21, 2020

United States Expands Export Controls Targeting Huawei’s Access to US Technology

May 18, 2020

Treasury Issues Interim Rule for CFIUS Filing Fees

April 30, 2020

FEMA Temporarily Bans Exports of Scarce or Threatened Personal Protective Equipment

April 13, 2020

Door Opens to Non-Traditional SBA Lenders’ Participation in SBA’s Paycheck Protection Program

April 9, 2020

President Trump Orders Chinese Company to Divest Acquisition of US Hotel Software Company

March 9, 2020

Treasury Issues Proposed Rule for CFIUS Filing Fees

March 5, 2020

Heads Up: AML and Economic Sanctions Moves the Crypto Industry Should Watch for From Regulators in 2020

February 25, 2020

Treasury Finalizes New CFIUS Regulations

January 14, 2020

Department of Justice Revises Guidance on Export Control and Sanctions Enforcement Policy

December 17, 2019

United States Lifts Sanctions on Turkish Government Ministries and Cabinet Officials

October 24, 2019

DOJ Lifts the Curtain on Evaluating Claims of “Inability to Pay”

October 16, 2019

United States Imposes Sanctions on Turkish Government Ministries and Cabinet Officials

October 15, 2019

Treasury Issues Long-Awaited Proposed CFIUS Regulations

September 30, 2019

FinCEN SPEAKS CRYPTO: Extensive New Guidance for ICOs, Digital Wallets, DApps, Trading Platforms, Decentralized Exchanges, and others in the Blockchain and Crypto Space

May 16, 2019

Expansion of US Economic Sanctions Measures on Iran, Venezuela, and Other Jurisdictions Compel Companies Operating Internationally to React Quickly

May 8, 2019


In the News

Press Releases