2012-present: Executive Director, Virginia Bioinformatics Institute 2008-present: Director Fralin Life Science Institute 2008-2010: Director, Virginia Tech Carilion Research Institute 2006-2008 :Term Director, Institute for Biomedical & Public Health Sciences 2002–2008: Director, Fralin Biotechnology Center 1995–2002 : Associate Director, Fralin Biotechnology Center 1994–present : Professor, Department of Biochemistry 1988–1994: Associate Professor, Department of Anaerobic Microbiology 1985–1988: Assistant Professor, Department of Anaerobic Microbiology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 1982–1985:Staff Scientist, Charles F. Kettering Research Laboratory, Ohio.