Brian Hennigan is a partner in the Los Angeles office of Irell & Manella LLP, where he is Co-Chair of the firm's Corporate Crisis and White Collar Criminal Defense Practice and a member of the firm's Executive Committee.

For the past twenty years, Mr. Hennigan has specialized in complex litigation, with an emphasis on white collar criminal defense. Over that time period, he has successfully represented individuals and corporations facing a wide array of challenges presented by federal prosecutors and investigating agencies. More recent representations have included the successful representations of individuals facing allegations under the Foreign Corrupt Practices Act, the Securities and Exchange Commission Act, the Internal Revenue Code, and the Sherman Act. In addition to corporate representations, Mr. Hennigan has represented several professional athletes, leaders of various religious denominations, doctors, lawyers, accountants, and business executives in federal criminal matters.

His skills at representing individuals in white collar investigations has garnered praise from numerous sources. Chambers USA ranked Mr. Hennigan in Band One every year since 2008 in the White Collar Crime & Government Investigations category and lauded him as a "creative thinker and problem solver" and as a "terrific attorney because of his great ability to communicate with judges and juries." Mr. Hennigan has the highest Martindale-Hubbell rating, a peer review rank of AV-Preeminent. He has consistently been recognized as one of the top white collar criminal defense lawyers by a variety of sources and was recently named the Los Angeles "Lawyer of the Year" in White Collar Criminal Defense by The Best Lawyers in America.

Mr. Hennigan has also established himself as a premier trial attorney in civil actions. His extensive civil experience includes securities and class action matter, patent licensing cases, antitrust cases, contracts cases, and unfair business practice cases. He has also successfully represented law firms and individual lawyers on malpractice claims with regard to complex tax matters.

Recognizing his accomplishments in civil and criminal representations, Mr. Hennigan is a Fellow of the American College of Trial Attorneys.

Before entering private practice, Mr. Hennigan served as an Assistant United States Attorney in the Central District of California, where he was an Assistant Division Chief for the Criminal Division of that Office. In that position, he conducted numerous grand jury investigation, was lead trial counsel in over thirty trials, and successfully represented the United States in numerous appeals before the Ninth Circuit Court of Appeals. For his work in the U.S. Attorney's Office, Mr. Hennigan received commendations from the Justice Departments, as well as from numerous government agencies.

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Honors & Awards

  • Chambers USA America's Leading Lawyers for Business, Top Ranking, 2003-present
  • Martindale-Hubbell, Peer Review ranking of "AV-Preeminent"
  • Best Lawyers' in America, 1998-present; named Los Angeles Criminal Defense White Collar Lawyer of the Year, 2010
  • Daily Journal, "Top 100 Lawyers in the State," 2009 and 2010
  • Los Angeles Magazine, "The 100 Most Influential Lawyers in Southern California," 2007-present
  • Super Lawyers listing, 1995-present
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Seminars & Speaking Engagements

  • Moderator, "Litigating FCPA Cases", American Bar Association, White Collar Crime Institute, scheduled for March 2013
  • Moderator, "Recent Developments in Fraud and Abuse Enforcement in Health Care", American Bar Association, Health Care Section, February 2012
  • "Trends in Enforcement and Prosecution of Ponzi Schemes", American Bar Association, National Securities Fraud Conference, October 2010
  • Moderator, "Town Hall Discussion on Brady Compliance", American Bar Association, National Sentencing Program, October 2010
  • Moderator, "Obstruction and False Statements: the Cover-Up is Worse than the Crime", American Bar Association, White Collar Crime Institute, March 2010
  • "Plain View, Yet Out of Sight: the Ninth Circuit Ruling on Electronic Evidence in Comprehensive Drug Testing", American Bar Association, Annual Meeting, August 2010
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Professional Activities

  • Co-Chair, American Bar Association, White Collar Crime Committee of the Criminal Justice Section, 2007-2011
  • Co-Chair, American Bar Association, White Collar Crime Committee of the Criminal Justice Section, West Coast Region, 2003-2007
  • Federal Bar Association, Los Angeles Chapter, Board of Governors, 1998-present; President, 2004-2005
  • Attorney Member, Disciplinary Committee, U.S. District Court, Central District of California, 2005-2011
  • Co-Chair, Los Angeles Food bank, "Food from the Bar" Program, 2010-present
  • Fellow, American College of Trial Lawyers
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Bar & Court Admissions

  • 1976, Illinois
  • 1979, California