Brian J Hennigan

Practice Areas

As one of the nation’s leading litigators, Brian Hennigan partners closely with clients to help them navigate civil and criminal litigation and obtain outstanding results. He has achieved those outcomes for corporations and individuals—including professional athletes, leaders of various religious denominations, doctors, lawyers, accountants and business executives—in numerous high-profile federal criminal matters. He recently defended clients against allegations under the Foreign Corrupt Practices Act, the Securities and Exchange Commission Act, the Internal Revenue Code and the Sherman Act.

In addition to his white collar defense practice, Mr. Hennigan represents clients in civil actions, including securities and class action matters, patent licensing, antitrust, contracts and unfair business practice cases. He has also defended law firms and individual lawyers in malpractice claims regarding complex tax matters.

Mr. Hennigan has earned significant praise from clients and colleagues. He is consistently ranked by Chambers in the White Collar Crime & Government Investigations category, with clients describing him as a “creative thinker and problem solver” and “a terrific attorney because of his great ability to communicate with judges and juries.”

Mr. Hennigan previously served as an assistant U.S. attorney in the Central District of California, where he was an assistant division chief for the office’s Criminal Division. In this position, he conducted numerous grand jury investigations, served as lead trial counsel in more than 30 trials, and successfully represented the U.S. in multiple appeals before the U.S. Court of Appeals for the Ninth Circuit.