Ms. Posner has represented institutional investors as a lead or co-lead counsel in a number of class and derivative actions, including cases involving securities fraud, consumer fraud, copyright infringement, and employment discrimination. Most notably, she was an integral member of the trial team that prosecuted the landmark In re Walt Disney Derivative Litigation, which redefined the fiduciary duties of directors in public companies, In re Mills Corporation Securities Litigation, which obtained $202.75 million plus interest for the class - the largest recovery ever achieved in a securities class action in Virginia, and the second largest ever achieved in the Fourth Circuit - and In re WellCare Health Plans, Inc., which obtained $200 million for the class - the largest recovery ever achieved in a securities class action in Florida and the second largest ever achieved in the Eleventh Circuit. Ms. Posner was also an integral member of the trial team that prosecuted In re Schering-Plough Corp./Enhance Securities Litigation and In re Merck & Co. Securities Litigation, which resulted in a combined $688 settlement. The combined $688 settlement represents the largest settlement in a securities class action from a pharmaceutical company, the second largest securities class action settlement in the Third Circuit and among the top 25 securities class action settlements of all time.
Ms. Posner is currently a member of the teams prosecuting Louisiana Municipal Police Employees’ Retirement System v. The Bank of New York Mellon Corporation and In re Green Mountain Coffee Roasters, Inc. Securities Litigation.
In 2013, Super Lawyers named Ms. Posner one of New York’s Rising Stars and Top Women Attorneys.
While in law school, Ms. Posner worked at the Lawyers' Committee for Civil Rights, Health Law Advocates, The Hale & Dorr Legal Services Center and the Tenant Advocacy Project.
Ms. Posner is a member of the New York Bar Association's Securities Litigation Committee and Public Justice.