Dr. Clark has taught courses in Molecular Biology and Bacterial Physiology and Biochemistry at Southern Illinois University since 1981. Research into the Regulation of Alcohol Fermentation in E. coli has been funded by the U.S. Department of Energy, Office of Basic Energy Sciences from 1982 till present. Supervised 11 master's and 7 PhD students Published approximately 70 articles in scientific journals Previously published work includes "Molecular Biology Made Simple and Fun" coauthored with Lonnie Russell. (Cache River Press, Vienna, IL, First edition, 1997 and Second edition, 2000)