Mr. Thornhill is both founder and senior partner of Thornhill Law Firm. Upon completion of his Bachelor of Arts and Juris Doctorate from Louisiana State University in 1974 and 1977, respectively, he then studied toward a Masters Degree in petroleum engineering at Tulane University from 1980 to 1983. Mr. Thornhill has served the bar in the Louisiana State Bar Association House of Delegates and as a member of the Louisiana House of Representatives, serving District 76 from 1996 to 2000. In the Legislature, Mr. Thornhill served on the House Appropriations, Insurance, and Retirement Committees, as well as on the Joint Legislative Committee on the Budget. Mr. Thornhill retired from the Legislature to become the President of Louisiana Trial Lawyers Association.
Mr. Thornhill's practice is litigation-oriented, focusing on complex civil litigation and class actions on insurance matters. These include proceedings involving corporate, environmental, health care, ERISA, oil and gas, general commercial, RICO, admiralty, casualty, and insurance matters. He is also involved in business association structuring, private and public project financing, and related transactions.
Mr. Thornhill is active in professional associations, including the Slidell, St. Tammany Parish, New Orleans, Louisiana State, Federal and American Bar Associations. He is admitted to every state and federal court in Louisiana, the Texas state bar, the Federal Court of Claims, the United States Tax Court and United States Supreme Court. He is an appointee to Who's Who in Global Business Leaders for 1993, International Who's Who, and Who's Who in Executives and Professionals. He has served as lecturer at the University of New Orleans in business associations law, and is currently a regular lecturer for the LAJ on current legislative topics. Mr. Thornhill is also involved in various community associations, as well as church and school board activities.