Daniel H. Ahn

Partner

Former senior federal prosecutor and DOJ trial attorney trusted by companies and individuals to navigate high-stakes investigations, enforcement actions, and regulatory scrutiny

“Daniel is an excellent communicator and a strong litigator with excellent experience as a former prosecutor.”

Chambers USA, Litigation: White-Collar Crime & Government Investigations client

“Daniel provides great support, combining extensive experience with understanding of customer needs.”

Chambers USA, Litigation: White-Collar Crime & Government Investigations client

“Daniel Ahn has strong experience from the Department of Justice and exceptional judgment.”

The Legal 500 US, Corporate Investigations and White-Collar Criminal Defense: Advice to Corporates

"Shout-out to a Reed Smith team led by Daniel Ahn, who secured a non-prosecution agreement for [his clients] in a Clean Water Act case brought by federal prosecutors in San Diego. U.S. District Judge Marilyn Huff signed off on the non-prosecution agreement after allowing the defendants to withdraw guilty pleas.”

AmLaw Litigation Daily, Litigator of the Week Runners-Up and Shout-Outs

Daniel is a leading white-collar and investigations lawyer and head of the firm’s West Coast Regulatory and Investigations practice. A former federal prosecutor and DOJ trial attorney, he guides clients through government investigations, enforcement actions, and high-stakes litigation, with an unyielding focus on results. He is also regularly called upon by companies to conduct sensitive internal investigations, often across borders.

Chambers-ranked in white-collar crime and government investigations, Daniel has deep experience in matters involving trade enforcement, economic sanctions, domestic and foreign corruption, RICO, consumer protection, environmental offenses, civil rights, and financial fraud, including securities fraud, health care fraud, and money laundering. For his case work, he has been recognized in AmLaw Litigation Daily’s Litigator of the Week Runners-Up and Shout-Outs. He also speaks and writes regularly on a range of white-collar and compliance issues, with major publications, including Bloomberg, Global Investigations Review, and the Wall Street Journal, turning to him for thought leadership.

Experience

Representative matters

Conducted sensitive internal investigation for multinational retailer in connection with congressional criminal referral alleging false statements to federal agency.
Successfully represented global engineering firm in cross-border procurement-fraud investigation in which federal prosecutors and multi-agency task force sought voluminous data and multiple witness interviews.
Secured declination for fintech company in DOJ and FBI cyber-fraud investigation following presentation.

Recognitions

  • AmLaw Litigation Daily, Litigator of the Week Runners-Up and Shout-Outs, 2025
  • Ranked in Chambers USA for California Litigation: White-Collar Crime & Government Investigations, 2025
  • Los Angeles Times Business of Law Visionaries, 2025

Credentials

Education

  • University of Southern California, 2004, J.D., Editor-in-Chief, Southern California Law Review; Lawyering Skills Instructor and Legal Writing Fellow; Western Regional Scholar
  • Johns Hopkins University, 2000, M.A., Bryce Harlow Fellow; Distinguished Alumnus Award
  • Biola University, 1997, B.A., magna cum laude, Epsilon Kappa Epsilon; Young Alumnus of the Year Award

Professional admissions & qualifications

  • California

Court admissions

  • U.S. Court of Appeals - Ninth Circuit
  • U.S. District Court - Central District of California
  • U.S. District Court - Eastern District of California
  • U.S. District Court - Northern District of California
  • U.S. District Court - Southern District of California
  • U.S. Supreme Court

Clerkships

  • U.S. Court of Appeals - Ninth Circuit, Honorable Johnnie B. Rawlinson
  • U.S. District Court - Central District of California, Honorable Gary L. Taylor

News

Blogs

Events