David P. Clark did his graduate work on bacterial antibiotic resistance to earn his Ph.D. from Bristol University, England. He later crossed the Atlantic to work as a postdoctoral researcher at Yale University and then the University of Illinois. Dr Clark recently retired from teaching Molecular Biology and Bacterial Physiology at Southern Illinois University which he joined in 1981. His research into the Regulation of Alcohol Fermentation in E. coli was funded by the U.S. Department of Energy, from 1982 till 2007. In 1991 he received a Royal Society Guest Research Fellowship to work at Sheffield University, England while on sabbatical leave.