Mr. Berry has served as a manager and an Advisory Committee Member of Dorchester Minerals Management GP LLC since February 2003. He is currently of counsel to Thompson & Knight L.L.P., a Texas based law firm. Mr. Berry has been an attorney with Thompson & Knight L.L.P., serving in various capacities since 1963, including as Managing Partner from 1986 to 1998. Mr. Berry previously served as Vice Chairman of the Advisory Board of the Institute for Energy Law of the Center for American and International Law (formerly Southwestern Legal Foundation). He is a past Chairman of the Natural Resources Committee of the Taxation Section of the American Bar Association and past Chairman of the Southwestern Legal Foundation Oil and Gas Tax Institute. From 1958 to 1960, Mr. Berry served as a Lieutenant in the United States Naval Reserve. He received his Bachelor of Business Administration degree in 1958 and his Bachelor of Laws Degree in 1963, both from the University of Texas.