Aaron R. Cooper is a partner in Jenner & Block’s Investigations, Compliance, and Defense Practice and its Government Controversies and Public Policy Litigation Practice. He joined the firm after nearly a decade of public service spanning all three branches of the federal government.  Formerly a lead Senate investigative counsel and accomplished Department of Justice (DOJ) cybercrimes prosecutor, Mr. Cooper’s broad experience in all phases of complex and sensitive government investigations, from criminal matters to congressional inquiries, offers clients rare insight into cross-cutting legal, investigative and cyber issues.

Mr. Cooper most recently served as the lead investigative counsel for the Minority in the Senate Select Committee on Intelligence’s bipartisan investigation of Russian interference in the 2016 US elections.  In this capacity, he also led the Minority in the Committee’s bipartisan inquiry into the intelligence community’s whistleblowing process and counseled Committee leadership and its members on election security, foreign influence operations, and national security oversight issues. Before his time in the Senate, Mr. Cooper served as a prosecutor in the DOJ’s Computer Crimes and Intellectual Property Section, where he investigated and prosecuted high-tech and intellectual property crimes.  In this role, Mr. Cooper also counseled Department leadership and investigative agencies across the spectrum of cutting-edge tech law issues, ranging from cybersecurity and encryption to data privacy and cross-border legal matters. 

While at the Department, Mr. Cooper was selected to serve as Counsel to the Assistant Attorney General for the Criminal Division and as a Special Assistant US Attorney in the Eastern District of Virginia.  In 2018, he was awarded the Attorney General’s Distinguished Service Award for his extensive work in support of the Clarifying Lawful Overseas Use of Data Act or CLOUD Act.  Mr. Cooper joined the Department of Justice in 2013 through its highly selective Honors Program following clerkships in the US Court of Appeals for the Third Circuit and the District Court of Maryland.  Outside of his practice, Mr. Cooper has taught courses at Georgetown University Law Center as an adjunct professor of law focusing on cybercrime and legal writing. He has also published legal scholarship in the American University Law Review addressing the intersection of government surveillance and congressional investigations.