Erin Casey Williams


Erin Casey Williams protects the interests of institutional investors and consumers through complex securities litigation.

Erin is a part of Motley Rice’s litigation teams representing investors in securities fraud class action cases throughout the country. She represents the firm’s clients in matters against AbbVie Inc.,, Inc., Abbott Laboratories, Upstart Holdings, Inc., and Qualcomm Incorporated. 

Erin also represented financial advisors in litigation against Wells Fargo which resulted in a $79 million settlement.* The financial advisors alleged Wells Fargo forfeited their deferred compensation in violation of the Employee Retirement Income Security Act (ERISA). Additionally, Erin is involved in the firm’s qui tam practice, working with relators to bring claims on behalf of the government.

Erin assisted in the development of deposition strategies and completed discovery with the Motley Rice securities team before joining the firm in 2017. Her previous experience includes litigating claims involving medical malpractice, wrongful death, personal injury and complex family law matters at a Charleston, S.C., law firm. She also researched and drafted memoranda regarding construction defects, insurance defense, and tort liability for a national litigation support agency.

While pursuing her law degree, Erin interned for the Federal Defender Program in Chicago in addition to working as a judicial extern for the Honorable Michael T. Mason of the U.S. District Court for the Northern District of Illinois. She served as an associate editor of the University of Illinois Law Review and the Community Service Chair of the Women’s Law Society.  

*Prior results do not guarantee a similar outcome.  


J.D., University of Illinois College of Law, 2014

B.S., with high honors, University of Illinois at Urbana-Champaign, 2011

Licensed In

  • South Carolina

Admitted to Practice Before

U.S. Court of Appeals for the Second Circuit

U.S. District Court for the District of South Carolina, and Eastern District of Michigan

U.S. District Court for the Northern District of Illinois


American Bar Association

South Carolina Bar Association

South Carolina Association for Justice

South Carolina Women Lawyers Association

Charleston County Bar Association

Awards and Accolades

Charleston, SC
2024  Ones to Watch list: Litigation - Securities