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William A. O'Leary - León Cosgrove León Cosgrove

León Cosgrove

William A. O’Leary

William O’Leary focuses his practice on complex commercial and business litigation. Prior to joining Leon Cosgrove, LLP, Mr. O’Leary served as a career judicial law clerk to the Honorable James Lawrence King of the United States District Court for the Southern District of Florida. In that role, he drafted numerous opinions and maintained primary responsibility for the court’s civil and criminal docket, where he was exposed to a wide variety of cases arising under many different practice areas. This experience has given him a unique insight into effective legal writing and oral advocacy, as well as a strong grasp of the Federal Rules of Civil Procedure and Federal Rules of Evidence.

Mr. O’Leary attended the University of Florida Levin College of Law, where he graduated in the top 5 percent of his class, with honors, while simultaneously serving as the vice-president of the Justice Campbell Thornal Florida Moot Court Team, a teaching assistant for a legal writing professor, an editor of the Florida Journal of Law and Public Policy and a summer associate for in-house counsel to a Fortune 500 company.