Elizabeth C. Guarnieri is a Senior Attorney in Cohen Milstein’s Securities Litigation & Investor Protection Practice Group, and a member of the Ethics and Fiduciary Counseling Practice. Ms. Guarnieri serves as the Firm’s Director of Investor Services. In the role of Director of Investor Services, she leads the Firm’s portfolio monitoring and damage calculation process and oversees client reports. She is an integral member of the Securities Case Evaluation Team, which analyzes new and potential securities actions.

In addition, Ms. Guarnieri led the Cohen Milstein team in developing the Firm’s proprietary portfolio monitoring and damage calculation system, COMPAS (Cohen Milstein Portfolio Assessment System).  She also oversaw the rollout of the COMPAS client self-service portal which provides clients with web access to monitoring information as well as historical portfolio monitoring reports.  She coordinates with our IT department and analysts to ensure the security of clients’ transactional information.

Prior to joining Cohen Milstein, Ms. Guarnieri spent nearly 10 years as a securities and antitrust litigator. Working at two prominent plaintiffs’ class action law firms in San Francisco, she represented individual and institutional investor clients in individual, class action and shareholder derivative securities litigation. Her decade of working on behalf of institutional investors has provided her with an experience and insight that she brings to her fiduciary and ethics counseling practice. Working with clients who have hired Cohen Milstein for fiduciary or ethics counseling, Ms. Guarnieri has undertaken a variety of projects — from researching and preparing presentations on fiduciary and ethics issues to assisting with the revision of an ethics code for a large county client. 

In addition to her litigation experience, Ms. Guarnieri also worked as a legal analyst with Bloomberg L.P., regularly contributing articles to Bloomberg’s Antitrust and Trade Law Reporter. She is the co-author of The Misapplication of American Pipe Tolling Principles, ABA Securities Litigation Journal, (Volume 21, Number 2, Winter 2011).

In her pro bono work, Ms. Guarnieri was one of a coalition of counsel that represented plaintiffs who sued Chevron for egregious injuries related to the company’s oil production in Nigeria.  She also served on the Board at the Meiklejohn Institute for Civil Liberties, an organization dedicated to developing innovative ways of using human rights law to promote equality and protect the disadvantaged.   

Ms. Guarnieri attended Rider University, graduating magna cum laude with a B.A. in Political Science, and earned her J.D. at Rutgers School of Law.