 1946-1947 Lewis, Will I. Will Lewis Enterprises Mt. Vernon, IL |
 1947-1948 Duncan, Walter Jr. Walter Duncan, Inc. Mt. Vernon, IL |
 1948-1950 Matthews, J. A. Independent Centralia, IL |
 1950-1951 Atkinson, J. R. C. L. McMahon, Inc. Evansville, IN |
 1951-1953 Calvert, F. A., Jr. Calvert Drilling, Inc. Olney, IL |
 1953-1955 Nolan, V. J. Independent Mt. Vernon, IL |
 1955-1956 Stewart, David Stewart & Moses Mattoon, IL |
 1956-1957 Reading, E. J. Sun Oil Company Evansville, IN |
 1957-1959 Duncan, Thomas Duncan Leases & Roy. Fairfield, IL |
 1959-1960 Brockman, H. L. Calvert Petroleum Co. Olney, IL |
 1960-1962 Farrar, Fletcher Farrar Oil Company Mt. Vernon, IL |
 1962-1964 Rue, Edward Bufay Oil Company Mt. Vernon, IL |
 1964-1966 |
 1966-1968 Podolsky, Bernard Podolsky Oil Company Fairfield, IL |
 1968-1971 Harris, Lloyd LaHoil, Inc. Mattoon, IL |
 1971-1973 Dull, Joe Dull Oil Company Mt. Vernon, IL |
 1973-1974 McCarty, James Shakespeare Oil Co. Salem, IL |
 1974-1975 Stewart, Robert |
 1975-1977 Radliff, L. Ray Radliff Drilling Co. Vandalia, IL |
 1977-1979 Rudy, Richard J. W. Rudy Company Clay City, IL |
 1979-1981 Prasuhn, Edwin Independent Fairfield, IL |
 1981-1983 Russell, L. F. "Red" Trico Industries Fairfield, IL |
 1983-1985 Glover, C. L. "Buddy" Glover Oilfield Service Clay City, IL |
 1985-1987 King, Stephen Consult. Geol.& Eng. Mt. Carmel, IL |
 1987-1989 Tracy, Harold "Gene" Tracy Trucking Co. Marine, IL |
 1989-1991 Collins, J Michael Triple C Oil Producers Casey, IL |
 1991-1993 Daniel, Marshall, "Buz" Rue & Daniel Assoc. Mt. Vernon, IL |
 1993-1995 Mitchell, Christopher Geo. Mitchell Drilling Carmi, IL |
 1995-1997 Herr, Robert, III Independent Mt. Vernon, IL |
 1997-1999 Dee, J. Roy, III Dee Drilling Company Mt. Carmel, IL |
 1999-2001 Larrabee, John Larrabee Oil Company Robinson, IL |
 2001- 2003 Cantrell, Jim Royal Drilling and Producing Company Crossville, IL |
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2003- 2005
Howard, Craig Howard Energy Corporation Mount Carmel, IL