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United States

Lawyers

Michael Attanasio

Michael Attanasio

Cooley LLP, United States

Work Department

Trials

Position

With more than 30 years of first-chair trial experience, Mike represents Fortune 500 companies and executives in high-stakes commercial litigation, white collar investigations, and enforcement matters. He also conducts internal investigations and advises Boards of Directors on strategic responses to litigation and regulatory risk. Over the course of his career, Mike has represented some of the most prominent companies in the world, including Google, Qualcomm, Sony, Illumina, and UnitedHealthcare, as well as individuals under investigation for securities fraud, insider trading, and price-fixing.

In addition to serving as a strategic adviser to several longtime clients, Mike has led teams in jury trials in state courts throughout California and in federal courts in New York, Washington, D.C., Texas, Ohio, Kentucky, and California. Frequently brought into high-stakes trials shortly before they are scheduled to begin, Mike is nationally recognized for his prowess in jury selection, cross-examination, and closing argument. He has deftly cross-examined senior executives, law enforcement agents, and expert witnesses in fields ranging from accounting and complex technology to DNA identification.

In one of the defining moments of his career, Mike served as lead counsel for Jenner & Block in its challenge to a retaliatory Executive Order issued by the President. The Executive Order sought to revoke security clearances, forbid access to federal buildings, and restrict the firm’s work with federal contractors. In less than a week, Mike led a Cooley team that filed suit to enjoin the Executive Order. His widely praised arguments secured first a temporary restraining order and then summary judgment. The litigation against the Executive Orders targeting the legal industry was hailed for its success in defending the profession and the rule of law.

A fellow in the American College of Trial Lawyers and a former federal prosecutor, Mike is ranked Band 1 by Chambers for Commercial Litigation and in 2026 he was recognized by the Daily Journal among its Leading Commercial Litigators in California. He has been named one of the Top 250 lawyers in America by Forbes, one of the Top 100 Lawyers in California by the Daily Journal, a “Game Changer” by The Recorder, and a “White Collar MVP” by Law360.

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