J.E. Todd - State Geologist from 1893 - 1903.
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This is a letter from J.E. Todd to the third South Dakota State Geologist, Freeman Ward.
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Ellwood C. Perisho - State Geologist from 1903 - 1914.
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Freeman Ward - State Geologist from 1915 - 1926.
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E. P. Rothrock - State Geologist from 1926 - 1957.
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Allen F. Agnew - State Geologist from 1957 - 1963.
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Duncan J. McGregor - State Geologist from 1963 - 1978.
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Merlin J. Tipton- State Geologist from 1978 - 1992.
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Cleo M. Christensen - State Geologist from 1992 - 1997.
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Derric L. Iles- State Geologist from 1997 - present.
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