Erin Casey Williams


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

Erin is a member of Motley Rice’s litigation teams representing investors in securities fraud class action cases. She supports the firm’s efforts in matters involving Qualcomm Incorporated and Investment Technology Group, Inc.

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.  


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

B.S. with 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 Association for Justice

South Carolina Women Lawyers Association

South Carolina Bar Association

Charleston County Bar Association

Awards and Accolades

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