The Legal 500

Twitter Logo Youtube Circle Icon LinkedIn Icon

Morgan, Lewis & Bockius LLP

Work +1 215 963 5000
Fax +1 215 963 5001

Marc Sonnenfeld

Work 215 963 5572
Morgan, Lewis & Bockius LLP

Work Department



Marc J. Sonnenfeld is a partner in Morgan Lewis's Litigation Practice and head of the Securities Litigation Group in Philadelphia. His practice focuses on defending securities and shareholder litigation and related regulatory and enforcement proceedings, defending shareholder class and derivative litigation challenging public company acquisitions, and counseling directors and officers and board committees on corporate governance issues. In addition, he has served as counsel for board of directors' special litigation committees for several public companies. Mr. Sonnenfeld was recently named a 2013 Client Service All-Star by BTI Consulting Group and was one of five attorneys named Securities MVP by Law360 in 2012. In addition, Morgan Lewis's Securities Practice was named Law360 Securities Group of the Year. Mr. Sonnenfeld has successfully defended shareholder class and derivative actions against public and private corporations, controlling shareholders, directors and officers, and underwriters arising under federal and state law. For more information, view Mr. Sonnenfeld's biography at


Fellow, American College of Trial Lawyers


Harvard Law School, 1971, J.D.; Swarthmore College, 1968, B.A.

United States: Dispute resolution

Securities litigation - defense

Within: Securities litigation - defense

Morgan, Lewis & Bockius LLP has 'a deep team with top-notch lawyers who understand the client exceptionally well'. Clients also praise the practice for its 'good leadership and client counseling, which includes telling the client what they need to hear, not just what they want to hear'. The firm defends public and private companies, financial institutions, underwriters, and officers and directors in federal and state courts, and frequently handles regulatory enforcement matters for broker-dealers, investment managers and funds. Jordan Hershman and Timothy Burke lead the securities enforcement and litigation practice from Boston, along with Susan Resley in San Francisco. 'All exercise sound judgment and are very good at handling complex cases with many moving parts', says one client. Charlene Shimada in San Francisco represented the underwriter defendants in In re Avalanche Biotechnologies, Inc. Securities Litigation. Also recommended are Marc Sonnenfeld in Philadelphia, Jason Frank and Michael Blanchard in Boston, and Mary Gail Gearns and Kenneth Schacter in New York.

[back to top]

Back to index

Legal Developments worldwide

Legal Developments and updates from the leading lawyers in each jurisdiction. To contribute, send an email request to