Mary Rose Alexander is the Managing Partner of the Chicago office of Latham & Watkins and a member of the Complex Commercial Litigation and Environment, Land & Resources Practices. She represents clients in complex commercial litigation and trials involving products, class actions, toxic torts, environmental matters, industrial accidents, insurance, and commercial contracts in state and federal courts and arbitration forums across the country.

A nationally recognized trial lawyer, Ms. Alexander represents Fortune 500 companies in some of their most difficult, high-stakes litigation, often in the most hostile jurisdictions.

She has been recognized by publications such as Chambers USA, Law Dragon, The American Lawyer, The Legal 500, Crain’s Chicago Business, and Best Lawyers in America for her trial work. Recently, Ms. Alexander was named to the Top 250 Women in Litigation 2022 by Benchmark Litigation, which recognized lawyers who “participat[ed] in some of the most impactful litigation matters in recent history.” In representing clients, she draws on considerable success defending against multi-state, multi-plaintiff litigation, particularly with energy, manufacturing, and chemical company clients. She is especially skilled in cases involving complicated scientific matters related to chemicals such as chlorinated solvents and polychlorinated biphenyls (PCB).

Ms. Alexander has tried scores of complex commercial cases across the country related to:

  • Public Nuisance / Toxic torts
  • Environmental regulations
  • Major industrial accidents
  • Product liability / consumer fraud
  • Energy / oil and gas contracts
  • Class actions
  • Insurance coverage

Her diverse platform and unique skill set led to her appointment as the firm’s Vice Chair of the Litigation & Trial Department and Local Chair of the Environment, Land & Resources Department.

A sample of the disputes Ms. Alexander has handled includes representing:

  • Clorox in alleged public nuisance litigation regarding ocean plastic
  • Dow Chemical Company in alleged public nuisance litigation relating to PCE released from multiple California dry cleaner sites; 2022 jury trial setting
  • Weyerhaeuser in multiple putative class actions / product liability and consumer fraud lawsuits involving building products following national recall; recent jury trial
  • Monsanto in multiple public nuisance lawsuits brought by municipalities and states involving PCB contamination in various West Coast water bodies
  • Nalco Company in numerous class actions arising out of the Gulf of Mexico 2010 oil spill; obtained summary judgment that claims are preempted by federal law
  • Mercuria Energy Trading Inc. in recent state court trial involving crude by rail facility
  • CONSOL Inc. in a recent state court trial involving a midstream gas joint venture; obtained complete trial victory
  • Northern States Power Company of Wisconsin in CERCLA litigation involving PAH contamination; recent federal trial
  • Georgia-Pacific Corporation in CERCLA litigation involving the US$1.6 billion PCB remediation of the Fox River; recent federal trials
  • Chevron Corporation in toxic tort litigation involving nuclear contamination on the University of Tulsa’s Oklahoma campus; recent motion to dismiss victory
  • Arizona Public Service Company in an arbitration involving a coal supply contract with the Navajo Nation
  • Buckeye Pipeline company in a 400-plaintiff toxic tort litigation involving alleged drinking water contamination; obtained complete resolution
  • Kuhlman Electric Corporation in multi-plaintiff, multi-jurisdiction toxic tort litigation involving alleged PCB personal injury and property damage; obtained complete resolution
  • General Dynamics Ordnance and Tactical Systems in a CERCLA mediation involving alleged solvent contamination at Crab Orchard Site

Bar Qualification

  • California
  • Illinois


  • JD, Columbia University School of Law, 1989
  • BA, University of California, San Diego, 1986

Languages Spoken

  • English