EnerVest, Ltd. (EnerVest) is recognized as one of the largest and most successful managers of oil and gas assets for institutional investors. The company currently operates more than 18,000 wells in 12 states: Arkansas, Colorado, Kansas, Louisiana, Michigan, New Mexico, New York, Ohio, Oklahoma, Pennsylvania, Texas and West Virginia. In the company's 18-year history, EnerVest partnerships have generated rates of return in excess of 34 percent throughout the up-and-down cycles of the industry. EnerVest was organized on September 1992 by John B. Walker, President and Chief Executive Officer, and Jon Rex Jones, Chairman. EnerVest was created to acquire, operate and manage oil and gas properties on behalf of institutional investors.