Mimi Y. Liu


Mimi Liu protects public resources and interests through investigations and litigation filed for state attorneys general, governments, and other public entities.

Mimi plays a leading role in representing states in litigation against the manufacturers of opioids alleging deceptive marketing and distribution of opioids.

Prior to joining Motley Rice, Mimi represented public clients in consumer protection and civil enforcement matters at a law firm in D.C. In litigation filed for the Mississippi Attorney General, she investigated national credit bureaus accused of violating state and federal laws by failing to maintain accurate credit files, ultimately recovering more than $7 million* in relief and other consumer benefits. 

She litigated claims of deceptive collection practices regarding consumer credit, auto loan and student loan debt, resulting in $9 million in relief and statewide injunctive relief in Mississippi. Mimi previously represented the New Hampshire Attorney General in an investigation alleging deceptive marketing of highly addictive opioid drugs, recovering millions of dollars in relief for New Hampshire. 

She also represents state attorneys general litigating for consumers alleging harm or economic loss due to deceptive marketing of defective Takata airbags, the largest auto-related recall in U.S. history. Mimi also represents a state attorney general litigating against a large auto lender for alleged unfair and deceptive practices toward subprime consumers and, separately, against a medical device manufacturer for unfair and deceptive practices in the sale and marketing of surgical mesh products. 

In addition, Mimi advocated for constitutional civil rights as a senior lawyer for Planned Parenthood Federation of America from 2004 to 2012, arguing cases before numerous state and federal trial and appeals courts. 

During her studies at Harvard Law School, Mimi served as executive editor of the Human Rights Journal and co-authored the treatise Gender Asylum Law. Following law school, Mimi clerked for the Court of Appeals of Alberta and for the Honorable Justice Claire L’Heureux-Dubé of the Supreme Court of Canada. 

Active in the legal community, Mimi serves on the board of directors for Public Justice, a national nonprofit legal advocacy organization that pursues high impact lawsuits to combat social and economic injustice, protect the Earth’s sustainability, and challenge predatory corporate conduct and government abuses.

*Please remember that every case is different. Any result we achieve for one client in one matter does not necessarily indicate similar results can be obtained for other clients. 


J.D. cum laude, Harvard Law School, 1999

B.Com. with honors, University of Alberta, 1996

Licensed In

  • District of Columbia
  • New York

Admitted to Practice Before

U.S. Supreme Court

U.S. Court of Appeals for the Sixth, Eighth and Ninth Circuits

U.S. District Court for the District of Columbia


Public Justice Foundation, Board of Directors

Awards and Accolades

2019–2023 Lawdragon 500 Plaintiff Financial Lawyers