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Jennifer Kies Mammen counsels clients on a variety of national security issues including structuring transactions to protect business-critical facility clearances and secure approval from the Committee on Foreign Investment in the United States (CFIUS). She frequently advises companies and individuals regarding security clearances, including all aspects of compliance with federal regulations relating to individual clearances, facility clearances, and foreign, ownership, control, or influence (FOCI) and has successfully represented individuals in gaining and retaining individual clearances at hearings before the Defense Office of Hearings and Appeals.

In addition to national security matters, Ms. Mammen represents companies and individuals in a variety of matters related to federal regulations and government contracts, including investigating, defending, and negotiating federal criminal and regulatory matters and claims brought under the FCA and FCPA. Her investigations-related work has involved assisting clients under investigation by the Department of Justice, the Securities Exchange Commission, the Nuclear Regulatory Commission, and the Commodity Future Trading Commission. She also advises employers on preparing policies and procedures to address whistleblowers and prevent retaliation.


Civic Involvement & Honors

    • Washington, D.C., Super Lawyers 2014, "Rising Star"
    • Washington, D.C., Super Lawyers 2015, "Rising Star"
    • Washington, D.C., Super Lawyers 2016, "Rising Star"
    • Washington, D.C., Super Lawyers 2015, "Rising Star"
    • Washington, D.C., Super Lawyers 2016, "Rising Star"
    • Washington, D.C., Super Lawyers 2016, "Rising Star"
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  • Co-author, “Expanded role of CFIUS in international business operations after FIRRMA,” International Business Law Journal, March 2019.
  • Co-author, “The Recent Strengthening of the Control of Foreign Investments in the Defense and Aeronautics Sector in the United States,” Air et Cosmos, December 2018.
  • Co-author, "The Role of CFIUS in International Business Transactions," International Business Law Journal, June 2017
  • Co-author, "U.S. Uses CFIUS Regulatory Authority to Prohibit Transaction Between Two German Entities," World Trade Controls Blog, Feb. 16, 2017
  • Co-author, "New Insider Threat Regulations to Hit Contractors Hard," National Defense Magazine, Nov. 18, 2016
  • "Whistling Fast and Furious: SEC and CFTC Continue to Issue Awards," Journal of Investment Compliance, 2016

Speaking Engagements

  • Co-presenter, “Post Conference Workshop:  A Hands on and Complete Review of the False Claims Act, Key Cases, and Major Developments of 2017,” ACI’s 5th Advanced Forum on False Claims & Qui Tam Enforcement, January 2018.
  • Co-presenter, “Analyzing Your Company’s Specific FOCI Risk:  Determining the Appropriate Mitigation Arrangement and Preventing Delays in Obtaining Approvals,” ACI's 2nd National Forum on FOCI, April 2019.