Kate Ó Súilleabháin - Maron Marvel

Kate Ó Súilleabháin


Kate Ó Súilleabháin centers her practice around general liability and toxic and mass tort litigation. She guides her corporate clients through complex exposure litigation, offering strategic advice and best practices throughout the discovery and motion practice phases.

Kate draws from 15 years of legal experience to provide clients with well-rounded, researched-backed defense strategies. Having worked on the plaintiff side as well as the defense in personal injury and multidistrict litigation, she brings a unique perspective and insight to cases at the federal and state levels.

Before joining Maron Marvel, Kate was a research attorney for the First District Appellate Court in Illinois. Her legal background also includes appellate practice, medical malpractice defense, and contract, business tort, securities, bankruptcy, and antitrust litigation. Kate is also a seasoned writer, having contributed to multiple legal handbooks and works published by the American Bar Association and other organizations.

Kate has an active history of pro bono work and was recognized as a Pro Bono Attorney of the Month by Illinois Legal Aid Online for her successful representation of a family in an asylum case. She is currently a volunteer tutor for Tutoring Chicago.


Georgetown University Law Center (J.D.)

Cambridge University (B.A., & M.A.)

Loyola University of Chicago, (B.A.)


Contributor, “Zero Tolerance: Best Practices for Combating Sex-Based Harassment in the Legal Profession,” American Bar Association (Wendi S. Lazar, Terese M. Connolly, & Gregory S. Chiarello, eds., 2018).

Ethan A. Berghoff & Kate Ó Súilleabháin, “Attorney-Client Privilege in the International Sphere,” International Litigation Strategies and Practice 273–92 (Barton Legum, Theodore Edelman, & Ethan A. Berghoff, eds., 2d ed., 2014).

Lecturer, Medical Device and Pharmaceutical Recalls, DePaul University College of Law, Chicago, Health Law Institute Series (2012).

Author, “FTC v. Actavis, Inc.: Pay-for-Delay Settlements Subject to Rule of Reason,” 51 ISBA Antitrust & Unfair Competition L., June 2013.

Author, “Recent Developments in Litigation on ‘Pay-for-Delay’ Settlements,” 50 ISBA Antitrust & Unfair Competition L., Aug. 2012.

Michael J. Wagner & Kate Ó Súilleabháin, “United States,” Global Privilege Handbook (2011).

Michael J. Wagner & Kate Ó Súilleabháin, “Drug and Device Product Recalls: Prevention and Plan of Action,” Cross-Border Life Sciences Handbook 2010/2011.

Michael C. McCutcheon & Kate Ó Súilleabháin, “Proposed Amendments to Federal Rule of Civil Procedure 26 to Substantively Change Expert Witness Disclosure and Discovery Requirements,” 21(1) IDC Q. 1 (2010).

Author, “Who Will Watch the Watchmen? Rating-Agency Liability in Securities Litigation,” 20(4) ABA Sec. Litig. J. 1 (2010).


American Bar Association – Member

Chicago Bar Association Alliance for Women – Previous Newsletter Editor, Executive Committee

Illinois State Bar Association, Antitrust and Unfair Competition Law Section – Previous Newsletter Editor, Executive Committee

ABA Section of Litigation, Young Lawyers’ Subcommittee of Securities Litigation – Previous Co-Chair