Abby Bartine is a Litigation & Dispute Resolution associate in Mayer Brown’s Chicago office. She practices in the areas of complex commercial litigation, internal investigations, and white collar defense and compliance. 

A significant portion of Abby’s civil practice is devoted to litigating individual and class claims arising under the Employee Retirement Income Security Act (“ERISA”).  Her experience includes representation of plan sponsors, benefit plans, and plan fiduciaries before the courts and the Department of Labor relating to a wide variety of ERISA claims, including those concerning fee arrangements, investment management strategies, severance disputes, benefit claim denials, and disputes over actuarial assumptions in the calculation of pension benefits.  In addition to her ERISA practice, Abby litigates cases across a range of substantive areas, such as post-closing disputes, professional liability cases, and mass torts and environmental claims.

Abby also has broad experience representing individuals and corporations in the course of internal investigations and compliance matters, as well as defending clients who are the subject of government investigations and enforcement actions.  She has represented clients in matters concerning the Foreign Corrupt Practices Act, securities regulations, the False Claims Act, and economic sanctions.  Building on her civil and criminal practices, Abby also routinely assists clients in conducting due diligence for mergers and acquisitions.

Abby originally joined Mayer Brown in 2013 and rejoined the firm in 2019 after completing a two-year clerkship with the United States District Court for the Northern District of California. In 2015, Abby was seconded to a major international financial institution where she worked closely with the bank to evaluate and strengthen its global anti-corruption compliance program.  Abby graduated from the University of Iowa College of Law with highest distinction and was elected to the Order of the Coif. She was also a member and contributing editor of the Iowa Law Review. Prior to law school, Abby served as an aide in the United States Senate from 2008 to 2010.

Securities Investigations: Internal, Civil and Criminal


  • Represented a global defense company in two separate class actions challenging the administration and investments of its 401(k) plan with excess of $16 billion in assets. In both cases, achieved favorable settlements at the outset of trial after successfully narrowing the claims on summary judgment. 
  • Represents a global defense company in a nationwide class action challenging the administration of the company’s severance plan.
  • Representing a global oil and gas company in a nationwide putative class action against broad challenge to the administration of its retirement plan and selection of investment options.
  • Representing a large telecommunications company in a nationwide putative class action involving various alleged violations of ERISA in the calculation of actuarially equivalent pension benefits.
  • Represented an international bank in an individual claim for benefits and for equitable relief concerning determinations over eligibility for long-term disability benefits.


The University of Iowa College of Law, JD, with highest distinction
Order of the Coif; Contributing editor and student writer, Iowa Law Review

The University of Iowa, BA, with high distinction
Phi Beta Kappa


  • Illinois
  • California


  • US District Court for the Eastern District of Michigan
  • US District Court for the Northern District of California
  • US District Court for the Northern District of Illinois
  • US District Court for the Central District of Illinois