Leo O’Toole, Associate — Watstein Terepka LLP

Associate

Leo O’Toole

Trial and appellate litigator who has handled disputes with billions in exposure — from the New York AG's opioid trial team to the federal courts. Yale-trained; every stage, plaintiff or defense.

Yale Law
J.D.
$2B+
NY Opioid Verdicts (AAG)
E.D. Pa.
Clerk · Hon. Padova
summa cum laude
Emory · Phi Beta Kappa

Leo O’Toole is an experienced litigator who has represented plaintiffs and defendants in numerous complex, high-stakes disputes, including several involving billions in exposure. His experience covers virtually every stage of litigation, from pre-suit investigations to trial to post-verdict litigation. He has litigated a broad variety of substantive claims, ranging from mass-action breach-of-fiduciary-duty and employment disputes to Voting Rights Act claims and claims of public nuisance.

Prior to joining Watstein Terepka, Leo was an Assistant Attorney General at the New York Attorney General’s Office, where he was part of the opioid trial team that won jury liability verdicts against five corporate defendants and secured more than $2 billion in relief for the State of New York. He also served as a law clerk to the Honorable John R. Padova of the U.S. District Court for the Eastern District of Pennsylvania, and worked as a litigation associate for a V10 firm in New York.

Leo graduated from Yale Law School, where he was a Senior Editor of the Yale Journal of International Law and a member of the Trial Advocacy Team and the Willem C. Vis Commercial Arbitration Moot Team. Prior to Yale, he graduated summa cum laude and Phi Beta Kappa from Emory College, where he received the Robert W. Woodruff Scholarship, Emory’s highest academic scholarship. He was later awarded the German Chancellor Fellowship by the Alexander von Humboldt Foundation and spent a year at the University of Augsburg conducting comparative research into the American and German opioid systems.

Complex Commercial Litigation Class & Mass Actions Trials & Appeals Public Nuisance & Government Litigation Employment Disputes

Frequently Asked

Quick answers about Leo's practice, background, and admissions.

What does Leo O'Toole practice?
Leo is an experienced litigator who has represented plaintiffs and defendants in complex, high-stakes disputes — several involving billions in exposure — across virtually every stage of litigation, from pre-suit investigation through trial and post-verdict proceedings. His matters have ranged from breach of fiduciary duty and employment disputes to Voting Rights Act and public-nuisance claims.
What did Leo O'Toole do before Watstein Terepka?
Leo was an Assistant Attorney General at the New York Attorney General's Office, where he was part of the opioid trial team that won jury liability verdicts against five corporate defendants and secured more than $2 billion in relief for the State of New York. He also clerked for Judge John R. Padova of the Eastern District of Pennsylvania and practiced at a V10 firm.
Where did Leo O'Toole go to law school?
Leo graduated from Yale Law School, where he was a Senior Editor of the Yale Journal of International Law and a member of the Trial Advocacy and Vis Moot teams. He graduated summa cum laude and Phi Beta Kappa from Emory College as a Robert W. Woodruff Scholar, and later held the German Chancellor Fellowship.
Where is Leo O'Toole admitted to practice?
Leo is admitted in New York and before the Southern and Eastern Districts of New York.

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