FacultyFaculty/Author Profile
Thomas A. Leghorn

Thomas A. Leghorn

Wilson Elser Moskowitz Edelman & Dicker LLP

New York, NY, USA

Tom Leghorn is regional managing partner for Wilson Elser's New York office and a member of the firm's Executive Committee. Tom focuses on defending professional liability claims against lawyers and on intellectual property litigation. He is co-chair of Wilson Elser’s Lawyers' Liability practice and is one of New York’s most experienced attorneys in this area of the law. Tom’s practice also encompasses the defense of insurance agents and brokers, securities broker- dealers, and other professionals, as well as intellectual property and complex commercial litigation, including the representation of European companies in U.S.-based matters. He has served as liaison to the firm’s French affiliate since 1994.

Tom has defended legal malpractice claims for 30 years. Tom’s extensive experience enables  him to quickly assess a malpractice claim and recommend effective strategies for its resolution. Law firm defendants as well as their insurers also appreciate the added value Tom provides by putting procedures in place to help them avoid repeat claims. His understanding of the nuances of intellectual property law is an added benefit for IP law firms seeking professional liability counsel.

Areas of Focus

Professional Liability

Tom’s legal practice places an emphasis on the defense of attorneys in lawyer liability matters. He has defended law firms throughout the United States, trying cases in both the state and federal courts. In addition to trial work and appeals, Tom has been retained by many firms to conduct risk management audits and to act as outside general counsel.

As part of his professional liability practice, Tom has been involved in the defense of insurance agents and brokers against claims that run the gamut from alleged failure to secure homeowners coverage to multimillion-dollar lawsuits against the world’s largest brokers. Tom’s practice also has involved insurance coverage matters in the professional liability area involving lawyers, accountants, and insurance agents errors and omissions policies.

Intellectual Property

As former chair of the firm’s Intellectual Property practice, Tom has addressed matters of copyrights, trademarks, and the defense of patent claims, as well as all aspects of e-commerce and media liability/defamation. He has experience at the U.S. Patent and Trademark Office, including proceedings before the Trademark Trial and Appeal Board. Tom also has developed programs that increase trade secret protection through the use of restrictive covenants in contracts for company executives and key employees. In addition, he has acted as an expert witness in federal court on the scope of coverage for intellectual property claims under a CGL’s advertising injury provisions.


Data Privacy & Security Europe


Insurance Agents & Brokers

Intellectual Property


Professional Liability & Services

United Kingdom



New York


U.S. District Court, Eastern, Northern and Southern Districts of New York

U.S. Court of Appeals, Second Circuit

U.S. Supreme Court

Memberships & Affiliations

American Bar Association

International Bar Association

Awards & Distinctions

Selected for inclusion in New York Super Lawyers, 2007-2015

Data Privacy & Security Europe


New York University, LL.M., 1987

St. John's University, J.D., 1981, St. John's Law Review

New York University, B.A., 1977


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