Rosa M. Tumialán


Tressler LLP
233 S. Wacker Drive
61st Floor
Chicago, IL 60606

Tel: 312-627-4191


Rosa Tumialán is a Partner in the Chicago office of Tressler LLP, an award-winning national law firm with offices 8 offices in 5 states. She focuses her practice on insurance coverage and litigation. Rosa is an accomplished appellate practitioner and class action defense lawyer with more than twenty years of experience, having appeared and argued in both state and federal courts nationwide.

Rosa’s insurer-related services include coverage opinion analysis and representing insurers in complex coverage disputes relating to personal and commercial lines, third party claims, surplus lines as well as claims handling practices and extracontractual liability. She has also litigated environmental coverage disputes throughout the Midwest for various insurers relating to superfund sites.

Rosa assists with drafting coverage documents for insurance pools and counsels clients in the administration of same. Her practice also includes serving as national coordinating coverage counsel for insurance clients who rely on her to develop and implement strategies nationwide in response to pattern litigation.

Rosa compliments her practice with extensive experience gained from judicial clerkships in the Chancery Division of the Circuit Court of Cook County and the First District Illinois Appellate Court. In addition to her reputation as an experienced insurance litigator, Rosa is an equally well-known class action defense lawyer with years of experience in defending class actions filed under the Telephone Consumer Protection Act (TCPA), Illinois Biometric Privacy Act (BIPA) as well as other consumer privacy statutes in both state and federal courts.

Rosa is lauded for her ability to develop and employ unique and aggressive strategies for her clients in these evolving areas. She is routinely sought out by companies seeking TCPA and BIPA compliance analysis or those who face TCPA and BIPA liability.

Rosa has recently been selected by her peers in the 2023 and 2024 edition of The Best Lawyers in America© for Insurance Law. She was also selected in the 2024 edition of The Best Lawyers in America® for Appellate Practice and Insurance Litigation.


  • B.S., University of Missouri-Columbia , with honors , Political Science , 1990
  • J.D., Loyola University Chicago School of Law , 1994

Tressler LLP’s experienced team of appellate lawyers have a depth of experience in all facets of appellate work at the state and federal levels in jurisdictions nationwide. The Firm’s appellate practice spans all areas of substantive and procedural law and includes Petitions to the highest courts of review in state court, as well as to the United States Supreme Court. Skilled advocates, Tressler’s appellate attorneys excel at the effective presentation of oral argument to courts of review. Tressler attorneys regularly work with trial counsel at the pre-trial, trial and post-trial phases of litigation so that our clients’ cases are optimally postured for the best possible result at trial and have the best possible record for appeal in the event of adverse trial results.

Tressler’s attorneys not only handle appeals generated from cases handled by the Firm, but are also retained to handle appeals involving significant or complex issues that were initially tried by in-house counsel or by other firms. We have also prepared Amicus briefs on substantive issues of public interest. The Firm’s appellate attorneys are also retained to provide an objective review and evaluation of appellate cases for clients who are seeking a second opinion about the chance for success in an appeal when faced with adverse trial decisions. Tressler’s appellate team includes attorneys who previously worked as clerks for state and federal appellate court judges, allowing us to provide unique insight regarding the appellate process that fosters valuable and practical consideration of all aspects of an appeal.

Tressler LLP is an award-winning law firm with eight offices located in five states – California, Illinois, New Jersey, New York and Pennsylvania. Tressler attorneys provide responsive client service and creative, cost-effective solutions for a wide range of legal matters. Our firm has significant depth and experience in the resolution of disputes through mediation, arbitration, litigation and trials. Tressler attorneys have litigated actions in all 50 states and are known for their seamless, responsive service.

Many Tressler attorneys are known for their representation of the insurance industry in coverage analysis and resolution, litigation, underwriting consultation, product development, defense, claims management and reinsurance. Tressler was recently selected as a 2023 and 2024 “Best Law Firm” for National Tier 1: Insurance Law by Best Lawyers. Tressler attorneys also represent clients in commercial litigation, employment, corporate transactions and intellectual property law. Tressler has one of the most experienced and multi-faceted government law practices in Illinois. Tressler is a Certified Great Place to Work© in the U.S.A.