Donald L. Vieira

Donald L. Vieira is a partner in the Washington, D.C., office of Wilson Sonsini Goodrich & Rosati, where he leads the firm’s Committee on Foreign Investment in the United States (CFIUS) and national security practice. Don represents clients in matters involving foreign investment, privacy, cybersecurity and data security, export enforcement, and government investigations.

Before joining the firm, Don served in senior national security positions in both the executive and legislative branches of the federal government. At the Department of Justice (DOJ), Don 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. Don 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 (FCC) Team Telecom process. While at DOJ, Don also 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, Don 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, Don led several classified committee investigations. He has also 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.

Don began his legal career as an associate at the law firm of Williams & Connolly, where he focused on litigation, white collar criminal defense, and Foreign Corrupt Practices Act investigations.

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