Zainab Ahmad is a partner in the New York office of Gibson, Dunn & Crutcher. She is co-chair of the firm's National Security Practice Group and a member of the White Collar Defense and Investigations, Privacy, Cybersecurity and Data Innovation and Labor and Employment Practice Groups. Zainab served as Senior Assistant Special Counsel in Special Counsel Robert S. Mueller’s Office following a successful career as a prosecutor and trial lawyer at the Department of Justice in both Washington, D.C. and the Eastern District of New York. As former Deputy Chief of the National Security and Cybercrime section at the U.S. Attorney’s Office in the Eastern District of New York, Zainab supervised a unit of over 20 attorneys, investigators, and staff prosecuting sensitive counterterrorism, counterespionage, and cybercrime cases. Zainab’s practice focuses on white collar defense and investigations, as well as regulatory and civil litigation challenges, such as matters involving corruption, anti-money laundering, sanctions and FCPA issues. She also advises clients on cybercrime and intellectual property issues, including handling investigations, enforcement defense, and litigation. She has extensive experience with a wide range of federal, state, and international cybersecurity laws, regulations, and standards.
Zainab has been ranked in the 2025, 2024, and 2023 editions of Chambers USA: America’s Leading Lawyers for Business as “Up and Coming” for White-Collar Crime & Government Investigations in New York. The Global Investigation Review had previously named Zainab among their “Top Women in Investigations” for 2021. She was also named by Benchmark Litigation as a 2025 “Future Star” and by Crain’s New York Business to the 2020 list of “Notable Women in Law.” Zainab has been honored with the Attorney General’s Award for Excellence in Furthering the Interests of U.S. National Security, New York City Bar Association’s Henry L. Stimson Medal recognizing Outstanding Assistant U.S. Attorneys, Executive Office of U.S. Attorneys Director’s Award for Superior Performance, FBI Director’s Award for Excellence in International Operations, U.K. Northwest Counter Terrorism Unit Commander’s Commendation, Federal Law Enforcement Foundation’s Federal Prosecutor of the Year Award, and the Society of Asian Federal Officers’ Prosecutor of the Year Award.
Prior to joining Gibson Dunn, Zainab was a prosecutor with the U.S. Department of Justice for 11 years. She most recently served as a Senior Assistant Special Counsel in Special Counsel Robert S. Mueller’s Office from 2017 to 2019. Prior, she served as an Assistant U.S. Attorney at the U.S. Attorney’s Office in the Eastern District of New York, where her roles included Deputy Chief of the National Security and Cybercrime section. During her tenure, she prosecuted and supervised some of the most complex international terrorism investigations in the United States, focusing on al-Qaeda, ISIS and attacks against U.S. military personnel and U.S. diplomats abroad. In pursuit of these extraterritorial national security investigations, she worked closely with the FBI, U.S. intelligence community, Department of State and Department of Defense, and she frequently traveled to Europe, the Middle East and Africa to negotiate with foreign law enforcement officials and regulators for access to evidence and testimony, and to collaborate with foreign counterparts regarding mutual legal assistance requests and extradition assurances. Her work was chronicled in a The New Yorker feature article, “Taking Down Terrorists in Court.”
During her career, Zainab was seconded twice to Washington, D.C., serving in 2016 as Counselor for Transnational Organized Crime and International Affairs and in 2017 as Acting Deputy Assistant Attorney General in Washington, D.C., where she was responsible for supervising about 70 prosecutors in three sections: Organized Crime & Gangs, Human Rights and Special Prosecutions, and Capital Cases, including the filter team handling the “Panama Papers”-related investigations.
Drawing on her experience, Zainab has played an active role in the advancement of global cybercrime laws and regulations. She previously represented the DOJ at meetings of the World Economic Forum’s Cybercrime Workshop and participated in development of WEF’s Guidance on Public-Private Information Sharing Against Cybercrime. She also organized and led a Cybercrime Roundtable with former FBI Director James Comey and General Counsel and C-suite executives from various industries, including banking, media, health care and pharmaceutical companies, to discuss improved public-private partnership in combatting cybercrime.
Zainab received her law degree in 2005 from the Columbia University School of Law, where she received the Hamilton Fellowship (full scholarship for academic excellence), was a James Kent Scholar and a Harlan Fiske Stone Scholar, and served as the Senior Editor of the Columbia Law Review. She served as a law clerk for Judge Jack B. Weinstein of the U.S. District Court for the Eastern District of New York from 2006 to 2007 and for Judge Reena Raggi of the U.S. Court of Appeals for the Second Circuit from 2007 to 2008.
Capabilities
- White Collar Defense and Investigations
- Labor and Employment
- National Security
- Privacy, Cybersecurity, and Data Innovation
- Tech and Innovation
- Transnational Litigation
- Trials
Credentials
Education:
- Columbia University - 2005 Juris Doctor
- Cornell University - 2002 Bachelor of Science
Admissions:
- New York Bar
Clerkships:
- US Court of Appeals, 2nd Circuit, Hon. Reena Raggi, 2007 - 2008
- USDC, Eastern District of New York, Hon. Jack B. Weinstein, 2006 - 2007