Mr. Thornhill is the founder and senior partner of Thornhill Law Firm. Mr. Thornhill received a Bachelor of Arts and Juris Doctorate from Louisiana State University in 1974 and 1977 respectively, and then studied toward a Masters Degree in petroleum engineering at Tulane University from 1980-83. Mr. Thornhill has served the bar in the Louisiana State Bar Association House of Delegates. He served also as a member of the Louisiana House of Representatives serving District 76 from 1996 until 2000. In the Legislature Mr. Thornhill served on the House Appropriations, Insurance and Retirement Committees and also 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. 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, as well as 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 lecturer on ERISA matters. Mr. Thornhill is also involved in various community associations, as well as church and school board activities.