Donald Vieira represents clients in matters involving foreign investment, privacy, cybersecurity and data security, export enforcement and government investigations. Mr. Vieira has significant experience representing clients in national security reviews before the Committee on Foreign Investment in the United States (CFIUS) and assisting clients on related issues, including Defense Security Service (DSS) export control compliance and economic sanctions.
He has represented numerous companies in matters related to cybersecurity, including incident response investigations into data breaches and network intrusions by both state and non-state actors. He has advised cybersecurity companies on the laws governing network intrusions and defense, and the rules governing data security in the federal acquisition regulations.
He also has represented numerous corporations, boards of directors and individuals in investigations, both internal and governmental, involving export controls and sanctions laws, the Foreign Corrupt Practices Act, inspectors general and congressional inquiries.
Mr. Vieira has served in senior national security positions in both the executive and legislative branches of the federal government. At the Department of Justice (DOJ), he was chief of staff of the National Security Division (NSD) and counselor to the assistant attorney general for national security.
In that role, he provided counsel to the DOJ’s senior leadership on issues related to cybersecurity, export controls and sanctions, counterterrorism, counterintelligence investigations, telecommunication and information technology, electronic surveillance and a variety of other intelligence matters.
He also supervised the DOJ’s Foreign Investment Review Staff, which is responsible for representing the Justice Department on CFIUS and related Exon/Florio activities, as well as the Federal Communication Commission’s Team Telecom process.
In this role, Mr. Vieira supervised the department’s work on hundreds of CFIUS reviews. In addition, he managed the NSD’s legislative portfolio and served as the division’s primary liaison to Congress, working closely with that legislative body on policy issues.
Prior to his appointment as NSD’s chief of staff, Mr. Vieira served as deputy chief counsel to the House Permanent Select Committee on Intelligence (HPSCI) and staff director of HPSCI’s Subcommittee on Oversight and Investigations.
At HPSCI, he led several classified committee investigations. He also has served as a federal prosecutor in the DOJ’s Counterespionage Section, where he participated in the successful prosecution of espionage cases as well as export and economic sanctions enforcement matters.
- J.D., Georgetown University Law Center (With Honors)
- B.A., Political Science, Boston University (With Honors)
- District of Columbia
- New York
Associations : Member, ABA Cybersecurity Legal Task Force
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