Brian J. Massengill: Lawyer with Mayer Brown LLP

Brian J. Massengill

Chicago,  IL  U.S.A.
Phone312 701 7268

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Experience & CredentialsOther Offices

Practice Areas

  • Litigation & Dispute Resolution
  • Banking & Finance Litigation
  • Internal Investigations
  • Professional Liability
  • Securities Litigation & Enforcement
  • White Collar Defense & Compliance
Contact InfoTelephone: 312 701 7268
Fax: 312 706 8741
University Indiana University, B.S. in Accounting, 1984
Law SchoolThe University of Chicago Law School, J.D., 1995
Admitted1995, Illinois; 1995, US District Court for the Northern District of Illinois; 1996, US Court of Appeals for the Seventh Circuit; 2013, US Court of Appeals for the Second Circuit; 2011, New York; 2012, US District Court for the Southern District of New York; 2001, US Court of Appeals for the Third Circuit

Brian Massengill focuses his practice on the intersection of litigation with accounting and finance issues. He is the co-leader of the firm's Professional Liability practice group.

Brian brings his background as a Certified Public Accountant, including eight years with a national accounting firm, to bear on his legal work. His practice focuses on the defense of accounting firms and he has represented firms in a variety of matters including SEC and PCAOB investigations, securities class actions, arbitrations and state accountancy board proceedings.

Brian's combined legal and accounting experience also enables him to serve clients in a variety of other contexts. He has represented companies in disputes arising from purchases and sales of businesses, including purchase price (post-closing adjustment) disputes, and suits alleging breaches of representations and warranties. He also has represented companies in SEC and other regulatory investigations, and contract and other disputes involving complex causation and damages issues. As part of his litigation practice, Brian has worked extensively with experts in the areas of auditing, accounting, causation and damages.

Prior to joining Mayer Brown in 1996, he was Law Clerk to The Honorable Frank H. Easterbrook, US Court of Appeals for the Seventh Circuit.

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Office Information

Brian J. Massengill

71 S. Wacker Drive
ChicagoIL 60606


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